Firmware Upgrade Guide: Audi TT MHI2_ER_AU43x_K1074_1 MU0884

Introduction to MIB2 Firmware Patching

This guide provides a detailed walkthrough on performing a firmware upgrade and patching the IFS-Root on Harman MIB2/2.5 HIGH infotainment systems, specifically focusing on the Audi TT with firmware MHI2_ER_AU43x_K1074_1 MU0884. This process is aimed at advanced users and professionals familiar with automotive diagnostic procedures and infotainment systems. Modifying your car’s infotainment system can unlock hidden features and enhance functionality, but it’s crucial to understand that these operations carry significant risks and should be undertaken with extreme caution.

Disclaimer: Everything you do is at your own risk! Be aware that you can damage your Main Unit. Reading this document carefully can potentially save you from bricking your system. If you find an error or have information not yet listed in this document, please share it in the mentioned forums to contribute to the community knowledge base.

Understanding the Terminology

Before we delve into the process, let’s clarify some key terms you’ll encounter throughout this guide:

Glossary:

• FW (Firmware): Software that controls the hardware of your MIB unit.
• MU (Main Unit): The central infotainment computer in your car.
• VAG: Volkswagen Aktiengesellschaft, the parent company of Volkswagen, Audi, Skoda, and Seat.
• MIB (Modular Infotainmentbaukasten): Modular Infotainment System platform used by VAG.
• MIB2 High/MIB2.5 High: Generations of the MIB system with enhanced features and performance.
• Harman: Manufacturer of the MIB High infotainment units for VAG.
• MMI (Multi Media Interface): Audi’s interface system for MIB units.
• FEC (Function Enabling Code): License codes to activate specific features like navigation, CarPlay, etc.
• SWaP (SoftWare as a Product): Another term for purchasable software features.
• RCC (Radio & Car Control Unit): Component within the MIB unit responsible for radio and car control functions.
• MMX (Multi-Media Extension Board): Component within the MIB unit handling multimedia processing.
• CP (Component Protection): Anti-theft system that limits functionality if components are swapped without authorization.
• SWDL (Software Download): Procedure for updating the system software.
• ODIS-S (Offboard Diagnostic Information System – Service): Diagnostic software used by dealerships for service.
• ODIS-E (Offboard Diagnostic Information System – Engineering): Diagnostic software with advanced engineering functions.
• Geko/VIN/VCRN: Terms related to vehicle identification and online access for component protection removal and feature activation.

References and Community Acknowledgements

This guide is built upon the collective knowledge of the online community. References have been added where possible, acknowledging that the original authors are not always known. Many thanks to everyone who has contributed to this shared knowledge, including but not limited to: chris2, jilleb, PorschePCMStuff, askac, Mr-Fix, CarPlayForFree, stollizei, daserds, MMInister, ivan13, 123Mib, DukeFawks, Honki26, salve007, Hovo_777, CaneTLOTW, car_driver, matze950, DEB & Rennlist members, and many more.

Key Online Discussions:

• Porsche PCM Upgrade Hack for Android Auto
• Audi MMI MIB2 MHI2 Firmware Update and Apple CarPlay/Android Auto Activation
• MIB2 Wiki by Mr-Fix

This guide is adapted from the original document: https://bit.ly/34iJYbH.

Version History and Terms of Use

Version Changes:

• V0.5: Initial release, version control, Audi FW notes, GEM activation with VCP/VCDS, MIB2Toolbox installation, new images.
• V0.6: Spanish and English translations available, editorial adjustments.
• V0.7: Current version.

Terms of Use: You are welcome to share and edit this document in any form. If you have annotations, suggestions for improvement, or new information, please share them. Post your new version online, for example, in the forums mentioned in this document.

Firmware Update Procedure

Before proceeding with patching, it is highly recommended to update your MIB2 unit to the latest available firmware version for your specific model and software train. Firmware updates often include bug fixes, performance improvements, and compatibility enhancements that are beneficial before attempting any modifications.

Important Considerations Before Updating:

1. Verify Firmware Compatibility: Ensure that the firmware you download is specifically designed for your Audi TT and MIB2 system (MHI2_ER_AU43x). Installing incorrect firmware can lead to system malfunctions.
2. Intermediate Updates: Depending on your current firmware version, you might need to install intermediate firmware versions before updating to the latest one. Consult relevant forums and resources for specific upgrade paths.
3. Latest Firmware First: Always install the latest official firmware before attempting to apply any patches. Patches are typically version-specific and may not work correctly on outdated firmware.

Downloading and Preparing Firmware:

1. Locate the Correct Firmware: Find the appropriate firmware update files for your Audi TT MHI2 system. Reputable sources include VAG update portals (access may require a valid subscription or access through authorized channels) and trusted online communities specializing in VAG modifications. (Example link from original document: https://bit.ly/2RxX6Uq – Verify the link validity and content before use)
2. Download Firmware Files: Download the firmware package to your computer.
3. Extract to SD Card: Once downloaded, extract the contents of the firmware package directly onto a FAT32 formatted SD card. Ensure the files are in the root directory of the SD card and not within subfolders.

Special Note for Audi Bose Sound Systems (Firmware P3634 and P3662):

Firmware updates P3634 and P3663 contain an update for the Bose sound system that improves sound quality. However, after updating with these versions, some users have reported a loss of sound. This is because the update process might erase specific sound parameters.

• If you encounter sound loss after these updates:

  • Dealer Parameter Reset: Your Audi dealer can restore the correct sound parameters using their diagnostic tools.
  • VCP Parameter Restoration: Alternatively, you can use VCP (VAG CAN Professional) diagnostic software to manually restore the parameters yourself or find someone with VCP access. (More information: https://bit.ly/33QKGNl – Verify link validity)

• Skipping Bose Update (Advanced Users Only): If you prefer to avoid potential sound issues or don’t have access to parameter restoration tools, you can attempt to skip the Bose sound system update during the firmware installation process using SWDL (Software Download). (More information: https://bit.ly/3kkGI5S – Verify link validity and procedure) This is a more complex procedure and not recommended for beginners.

Adding Missing Gracenote Database V2 (Firmware P3634 and P3663):

If you are updating from a very old firmware version (prior to P/K2519) to P3634 or P3663, you may need to manually add the Gracenote Generation 2 database. Detailed instructions on how to install the database can be found here: https://bit.ly/35RcGCP (Verify link validity and procedure). This database is responsible for displaying album art and music information.

Accessing Hidden Menus: RED / Service Menu

To initiate the firmware update and access advanced settings, you’ll need to enter hidden menus within your MIB2 system. There are different menus depending on your VAG brand.

Audi – Red Menu:

Alt Text: Audi MIB2 Red Engineering Menu interface showing software update options.

To access the “Red Menu” on Audi MIB2 systems:

1. Press and hold the “NAV/MAP” and “MEDIA” buttons simultaneously for approximately 30 seconds. The Red Menu should appear on your screen.
2. Navigate to “Software update/versions” within the Red Menu to start the update process.

Seat/Skoda/VW – Service Mode / Menu:

Alt Text: Volkswagen MIB2 Service Menu interface displaying system information and update options.

For Seat, Skoda, and Volkswagen MIB2 systems, the Service Menu is accessed differently:

1. Press and hold the “MENU” button for about 5 seconds. The Service Menu should appear.

Finding Firmware Version / SW Train:

Before updating, it’s essential to identify your current firmware version and software train. This information is crucial for selecting the correct update files.

1. Enter the Service/Red Menu (as described above).
2. Navigate to “Software update/versions”.
3. Identify SW Train: The detailed name displayed here is your current Software Train. This is the identifier you’ll need when searching for compatible updates online.
4. Identify MU Version: The “MU Version” is a shorter, more general version number of your firmware.

Enabling Green Engineering Menu / Engineering Mode

The Green Engineering Menu (GEM) provides access to advanced system settings and is required for installing the MIB2-Toolbox and performing IFS-Root patching. To enable it, you need to use diagnostic tools like VCP (VAG CAN Professional) or VCDS (VAG-COM Diagnostic System).

Using VCP (VAG CAN Professional):

1. Set Diagnostic Mode: In VCP, set the diagnostic mode to “Engineer Mode”.
2. Enter Login: Use the login code 20103.
3. Select “Adaptation”: Go to the “Adaptation” section in VCP.
4. Developer Mode: Find “Developer test mode” (Option number 45).
5. Activate Developer Mode: Set “Developer test mode” to “active”.
6. MIB Unit Restart: Restart your MIB unit by pressing and holding the power button for 30 seconds.

Using VCDS (VAG-COM Diagnostic System):

Alt Text: VCDS software interface showing adaptation channel for activating Developer test mode in Audi MIB2.

1. Access Code: Use access code S12345. (Note: This is a VCDS specific “fake” login to access engineering mode adaptations.)
2. Go to Adaptation [10]: Navigate to the “Adaptation” section in VCDS (Control module 5F – Information Electr.).
3. Select Developer Mode: Choose “IDE02122-Entwicklertestmodus” (Developer test mode).
4. Activate Developer Mode: Set the value to “active”.
5. MIB Unit Restart: Restart the MIB unit by pressing and holding the power button for 30 seconds.

Note on VCDS Login: The login code S12345 is not a standard login but a VCDS-specific method to access engineering mode adaptations. In some cases, S12345 might not work. If you encounter issues, try using the login code 20103, which is also used with VCP.

Accessing the Green Engineering Menu

Once the Engineering Mode is enabled via VCP or VCDS, you can access the Green Engineering Menu.

1. Press and hold the “MENU” button for 5 seconds.
2. Select “Green Engineering Menu” from the options that appear.

Alt Text: Audi MIB2 Green Engineering Menu interface with options for system configuration and testing.

Using SWDL (Software Download)

SWDL is a powerful tool within the MIB2 system that allows you to perform firmware updates, upload POIs (Points of Interest), and update maps. It bypasses some of the standard checks present in the regular update function, which can be helpful in specific situations, especially if the standard update process fails.

Important: SWDL does not enable cross-brand firmware flashing (e.g., flashing Skoda firmware on an Audi) or upgrading from MIB2 to MIB2.5. It is intended for updating within the same system generation and brand.

Accessing and Using SWDL:

1. Enter Green Engineering Menu.
2. Select “SWDL” from the menu options.
3. Manual Download: Check the box next to “Software Download Manual Download”.
4. Start Download: Press “Start Download”.
5. File Selection: On the next screen, you can manually select which software components you want to update. This is where you could potentially skip the Bose sound system update if desired (for advanced users, with caution).

Alt Text: MIB2 SWDL menu interface in Green Engineering Menu, showing manual download options and file selection.

Installing the MIB2-Toolbox

The MIB2-Toolbox is a collection of scripts and tools that simplifies various MIB2 system modifications, including enabling features and applying patches.

Installation Steps:

1. Download MIB2-Toolbox: Go to the MIB2-Toolbox GitHub page: https://github.com/jilleb/mib2-toolbox
2. Download ZIP File: Download the latest version of the toolbox as a ZIP file.
3. Extract to SD Card: Extract the contents of the ZIP file to a FAT32 formatted SD card. Place the extracted folders and files in the root directory of the SD card.
4. Insert SD Card: Insert the SD card into SD Slot 1 of your MIB2 HIGH unit (usually the left SD card slot).
5. Access Green Engineering Menu.
6. Navigate to “mib2-toolbox” within the Green Engineering Menu.
7. Select “mpbcoding” from the toolbox menu.
8. Install Scripts: Choose the option to install scripts from the SD card. Follow the on-screen prompts to complete the installation.
9. Restart MIB Unit: Restart your MIB unit after the installation is complete.

Alt Text: Series of images showing MIB2 Toolbox menu navigation and script installation process from SD card.

Establishing a Connection to MIB2 with Putty/Telnet

To perform advanced modifications like IFS-Root patching, you need to establish a Telnet connection to your MIB2 unit using a tool like Putty. This requires a USB-to-Ethernet adapter.

Required Hardware: USB to Ethernet Adapter

You will need a specific USB to Ethernet adapter that is compatible with the MIB2 system. A recommended adapter is:

• D-Link DUB-E100 HW rev. D1 (0x2001, 0x1a02) (USB Hardware ID in parentheses for compatibility verification)

This adapter and older revisions are generally readily available from online retailers like Amazon.

Connecting the Adapter:

1. Connect Adapter: Plug the USB end of the Ethernet adapter into the USB port in your car that is typically used for CarPlay/Android Auto.
2. Ethernet Connection: Connect an Ethernet cable from your laptop to the RJ45 port on the USB adapter.
3. Verify Connection: The LEDs on the adapter should start blinking, indicating a successful connection to the PC.

Older Supported Adapter Versions (Less Common):

• D-Link DUB-E100 rev. B1 (0x2001, 0x3c05)
• D-Link DUB-E100 rev. C1 (0x2001, 0x1a02)

Potentially Supported Adapters (Unverified):

Some unconfirmed reports suggest that the following adapters might also work, but they are not widely tested or available:

• SMSC9500 (0x0424, 0x9500)
• Germaneers LAN9514 (0x2721, 0xec00)
• Cinterion AH6A 3G (0x1e2d, 0x0055)
• Cinterion ALS1/ALS6 (0x1e2d, 0x0060)

Network Settings on Your Laptop:

In most cases, you do not need to manually configure IP addresses and can leave your network settings on “Automatic” (DHCP). However, if you experience connection problems, you might need to set a static IP address on your laptop’s Ethernet adapter.

Manual IP Configuration (If Necessary):

1. Access Network Settings: Open your computer’s network settings (e.g., “Network and Sharing Center” in Windows).
2. Adapter Settings: Go to “Change adapter settings” and locate your Ethernet adapter.
3. Properties: Right-click on the Ethernet adapter and select “Properties”.
4. Internet Protocol Version 4 (TCP/IPv4): Select “Internet Protocol Version 4 (TCP/IPv4)” and click “Properties”.
5. Set Static IP: Choose “Use the following IP address” and enter the following settings:
   • IP Address: 172.16.250.123
   • Subnet Mask: 255.255.255.0
   • Leave “Default gateway” and “DNS server addresses” blank.
6. Click “OK” to save the settings.

Using Putty (Telnet Client):

You can use any Telnet client, but Putty (https://www.putty.org/) is a popular and free option.

MIB2 Telnet Access Points:

The MIB2 unit offers Telnet access to two main components:

• RCC (Radio & Car Control Unit):

  • IP Address: 172.16.250.248
  • Port: 123 (Recommended)
  • The RCC shell is where the MIBRoot executable, FEC files, and variant data are located.

• MMX (Multi-Media Extension Board):

  • IP Address: 172.16.250.248
  • Port: 23

Recommendation: Always use the RCC (port 123) for Telnet access. Using incorrect flash commands on the MMX shell carries a higher risk of damaging the MMX component, which is harder to recover.

Accessing the RCC Shell via Putty:

1. Open Putty.

2. Select “Telnet” as the connection type.

3. Enter Host Name (or IP address): 172.16.250.248

4. Enter Port: 123

5. Click “Open”.

6. Login: When prompted for a login, type “root” and press Enter.

7. Password: Enter the root password corresponding to your firmware version from the password list provided earlier in this guide. Note: Password characters will not be displayed as you type. Press Enter to confirm.

8. RCC Shell Prompt: A successful login to the RCC shell will be indicated by a console prompt that looks like this:

   />

Accessing the MMX Shell via Putty (Not Recommended for Patching):

If you need to access the MMX shell for specific reasons (generally not required for IFS-Root patching), follow the same Putty connection steps as above, but use port 23 instead of 123. The MMX shell prompt looks like this:

#

Creating a Backup – ESSENTIAL!

Before making any modifications to your MIB2 system, creating a full backup is absolutely critical. A backup is your safety net in case anything goes wrong during the patching process. If you encounter issues, a backup can potentially restore your system to its previous working state.

Backup Procedure:

1. Prepare SD Card: Format a new SD card (minimum 2GB, FAT32 format). Important: The SD card must be formatted in FAT32.

2. Insert SD Card: Insert the formatted SD card into SD Slot 1 (left slot) of your MIB2 HIGH unit.

3. Establish RCC Telnet Connection: Connect to the RCC shell via Telnet using Putty as described in the previous section.

4. Execute Backup Commands: Carefully enter the following commands one by one into the Putty console, pressing Enter after each command. These commands will back up critical partitions and files to your SD card.

   # Check current directory (optional verification)
   ls
   
   # Mount SD Card Slot 1 (SD1) for writing
   mount -uw /net/mmx/fs/sda0/
   
   # Backup EEPROM (wait ~90 seconds after command execution)
   on -f rcc /usr/apps/modifyE2P r 0 10000 > /net/mmx/fs/sda0/eeprom.txt
   
   # Backup FecContainer.fec (FEC license codes)
   cp -r /net/rcc/mnt/efs-persist/FEC/FecContainer.fec /net/mmx/fs/sda0/FecContainer.fec
   
   # Backup Variant.txt (System variant information)
   cp -r /net/rcc/mnt/efs-persist/SWDL/Variant.txt /net/mmx/fs/sda0/Variant.txt
   
   # Backup RCC partition (fs0)
   cat /net/rcc/dev/fs0 > /net/mmx/fs/sda0/rcc_fs0
   
   # Backup MMX partition (fs0)
   cat /net/mmx/dev/fs0 > /net/mmx/fs/sda0/mmx_fs0

5. Wait for Backup Completion: Allow sufficient time for each command to complete, especially the EEPROM backup, which takes approximately 90 seconds.

6. Retrieve Backup Files: Once all commands are executed, safely remove the SD card from your MIB2 unit and copy all the backed-up files from the SD card to your computer. Store these backup files in a safe and accessible location. This is your system backup in case of any issues during the patching process.

Understanding and Managing FEC Codes

FEC codes (Function Enabling Codes) are license keys that activate specific features in your MIB2 system, such as navigation, smartphone interfaces (CarPlay, Android Auto), and other functionalities.

Common FEC Codes:

FEC Code	Function
00030000	AMI (USB Enable)
00030001	Gracenote
00040100	Navigation
00050000	Bluetooth
00060100	Vehicle Data Interface
00060200	Skoda/Audi Connect, VW CarNet
00060300	Mirror Link
00060400	Sport HMI (Performance Monitor)
00060500	Sport Chrono (Function Unknown)
00060600	Logbook (Function Unknown)
00060700	Online Services
00060800	Apple CarPlay
00060900	Google Android Auto
00060A00	Baidu CarLife for iOS (China only)
00060B00	Baidu CarLife for Android (China only)
00070100	SDS (Voice Control)
00070200	SDS (Voice Control) for Navigation
00070400	Digital Voice Enhancement

Generating FEC Codes for Map Support:

FEC codes for map activation follow a specific format: 0ABCCCDD

• A (Brand):
  • 2 = Audi
  • 3 = Bentley
  • 6 = Porsche
  • 7 = Seat
  • 8 = Skoda
  • 9 = VW
  • C = MAN
• B (MIB Version):
  • 1 = MIB1 HIGH (Harman)
  • 3 = MIB2 HIGH (Harman)
• CCC (Region):
  • 000 = Europe
  • 100 = USA and Canada (NAR – North America Region)
  • 400 = Middle East (AGCC – Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, UAE)
  • 401 = AGCC + Turkey
  • 402 = AGCC + Israel
  • 500 = South Africa
  • 600 = Australia and New Zealand
  • 700 = India
  • 800 = Argentina, Brazil, and Mexico
  • 801 = Chile
  • 900 = Asia / Pacific
  • D00 = Rest of the World (ROW)
• DD (Validity Year – Hexadecimal):
  • 4c = 2030
  • FF = ~2075/Lifetime

Examples for MIB2 High (Europe, valid until 2030):

• Skoda: 0830004c
• Audi: 0230004c
• VW: 0930004c
• Seat: 0730004c

Cross-Brand Map Data Compatibility:

Map data is compatible across VAG brands within the MIB2 High system. Once you activate map support using FEC codes, you can conveniently download map updates from the Volkswagen website (https://webspecial.volkswagen.de/vwinfotainment/ch/de/index/downloads/mapsdownload#/). These update files can be used for Audi, Seat, and Skoda MIB2 High units as well.

Recovering from a Corrupted FecContainer.fec

In rare cases, the FecContainer.fec file can become corrupted and uneditable. The exact cause is not always clear. If this happens, you can obtain a blank FecContainer.fec file as a starting point from resources like: https://anonymousfiles.io/R23UINaM/ (Verify link validity and source trustworthiness before use.)

Component Protection (KS) and Function Restoration (SWaP)

Component Protection (KS – Komponentenschutz) is an anti-theft measure in VAG vehicles. If your MIB unit was replaced or upgraded from MIB1 to MIB2, you might encounter “Component Protection” displayed on your navigation screen, and audio output may be disabled.

Resolving Component Protection:

Component Protection removal and function restoration typically require authorized access to the VAG GeKo (Geheime Komponente – Secret Component) online system.

1. Dealer or Online Service: You can visit your Audi dealer or find a reputable online service that offers Component Protection removal.
2. GeKo Access Required: Both steps below require GeKo logins. The second step might take a few minutes to complete.
   • Component Protection Removal (KS entfernen): This step removes the component protection lock from the MIB unit.
   • Function Restoration (Restore Functions/SWaP): This step retrieves the original SWaP (Software as a Product) feature licenses associated with your car’s VIN (Vehicle Identification Number) from VAG servers and reinstalls them on your MIB unit. This ensures that your originally purchased features are reactivated.

Why Function Restoration is Important: Function restoration is the cleaner approach because it starts with a fresh FecContainer.fec file that contains your car’s correct VIN and VCRN (Vehicle Configuration Record Number). You then only need to add any missing SWaP features you want to enable (e.g., CarPlay, Android Auto) via patching.

Finding Your VCRN (Vehicle Configuration Record Number)

The VCRN is a unique identifier associated with your vehicle’s configuration and is needed for certain modifications. You can retrieve your VCRN using diagnostic tools like VCDS, VCP, or OBD11.

Steps to Retrieve VCRN:

1. Connect Diagnostic Tool: Connect your VCDS/VCP/OBD11 tool to your car.
2. Access Control Module 5F – Information Electronic.
3. Go to “Adaptation”.
4. Enter Search Term: In the adaptation channel search, type or find “Individualization characteristic” or “IDE05814, Individualization characteristic”.
5. Copy VCRN Value: The current value displayed is your VCRN. It is typically a 5-byte hexadecimal value (e.g., FF FF FF FF FF – example only). Copy this value.

Adding New FEC Codes to the FecContainer.fec File

To activate new features or map regions, you need to add corresponding FEC codes to your FecContainer.fec file. You can use a tool called “WhatTheFec” (https://anonymousfiles.io/wDhkDbyu/ – Verify link validity and source trustworthiness before use.) to edit this file.

Editing FecContainer.fec with WhatTheFec:

1. Download WhatTheFec: Download the WhatTheFec tool from the provided link.

2. Open FecContainer.fec: Launch WhatTheFec and open your backed-up FecContainer.fec file.

3. Select Brand: Choose the brand of your car (Audi in this case) in WhatTheFec.

   Alt Text: WhatTheFec tool interface showing FEC code list and options for adding new codes.

4. Identify Original FECs (Green): Original FEC codes that are already active in your system will be displayed in green text. These are digitally signed by VAG.

5. Add New FEC Codes: To add new FEC codes, click the button next to “Collection” in WhatTheFec.

6. Enter New FEC Code: Enter the new FEC code you want to add (e.g., map code 0830004C for Skoda Europe maps).

7. New Codes (Red): Newly added FEC codes will be displayed in red text because they are not digitally signed by VAG.

   Alt Text: WhatTheFec tool interface showing newly added FEC code in red, indicating it’s not manufacturer-signed.

8. Save Edited FecContainer.fec: Save the modified FecContainer.fec file.

9. Replace on SD Card: Replace the original FecContainer.fec file on your SD card with the newly edited version.

Important: The FecContainer.fec file must be compatible with your car. If necessary, use WhatTheFec to adjust the VCRN and VIN within the file to match your vehicle.

Patching “ifs-root.ifs” in RCC

To enable the MIB2 system to accept unsigned FEC codes (the red codes you added in WhatTheFec), you need to patch the ifs-root.ifs file within the RCC partition. This is the most critical and risky step of the process.

Crucial Warnings:

• Version-Specific Patches: Each firmware version requires a specific patch. Never use a patch designed for a different firmware version. Doing so will likely brick your MIB2 unit.
• Flash Address Safety: Never flash to a hexadecimal address below 0x540000. This area of the RCC’s NOR flash memory contains the IFS Recovery Image. Overwriting this critical section will prevent the RCC from booting, making recovery significantly more complex.

Q&A about IFS-Root Patching:

• Why patch “ifs-root.ifs”?
  • The ifs-root.ifs file (filename may vary slightly depending on firmware) is a system image file located in the RCC’s NOR flash memory. It contains the MIBRoot executable.
  • MIBRoot is responsible for verifying the validity of FEC codes and managing Component Protection.
• Why patch MIBRoot?
  • To “hack” the system and enable unsigned FEC codes and bypass Component Protection checks, these security checks within MIBRoot need to be patched or removed.
• Are there different types of patches?
  • Yes, different patches exist for FEC verification, ExceptionList handling, CID (Component ID) checks, Component Protection, and other functionalities.
  • Some patches are publicly available, while others are not.
  • Patches may function differently internally but achieve the same goal: disabling FEC code verification.
• How to verify if a patch works?
  • The safest approach is to find reliable online communities and resources that provide instructions for creating patches yourself.
  • Alternatively, seek out trusted sources that offer pre-patched ifs-root.ifs files that have been tested and verified by other users.
• Why flashing is necessary? Can’t I just copy MIBRoot to the filesystem?
  • No, directly copying MIBRoot to the filesystem via SD card is generally not possible. The system partitions are typically mounted as read-only for security reasons. The command mount -uw /net/rcc/usr/apps/ does not change this restriction. Flashing replaces the original ifs-root.ifs image in the flash memory with the patched version.
• My RCC is bricked – can it be repaired?
  • Yes, if only the RCC is damaged, it is often repairable.
  • Look for resources and guides on RCC recovery. Online forums and communities specializing in MIB2 modifications are good places to seek help. (Example: https://bit.ly/2RAhODg – Verify link validity)
  • If you have some functionality remaining in either RCC or MMX, UART (Universal Asynchronous Receiver/Transmitter) communication might be an option for recovery.
  • If the RCC is completely unresponsive, you might need to use MMX for recovery. Seek assistance from experienced individuals in MIB2 repair.
  • Having a RCC backup (created earlier in this guide) is crucial for recovery at this stage.
• My MMX is bricked – can it be repaired?
  • Repairing a bricked MMX is significantly more complex and often not DIY-repairable.
  • The NOR flash chip (GL512S11DHA02) on the MMX board can be removed, reprogrammed using an external programmer, and then resoldered onto the board. This requires specialized equipment and skills.
  • Having a MMX backup (created earlier in this guide) is essential if MMX recovery is attempted.

Obtaining a Patched “ifs-root.ifs” File:

1. Pre-patched Files: Pre-patched ifs-root.ifs files are available for many firmware versions from online communities and forums. (Example link from original document: https://bit.ly/2RxX6Uq – Verify link validity and trustworthiness before use. Always verify the patch is for your exact firmware version: MHI2_ER_AU43x_K1074_1 MU0884)
2. Self-Patching (Advanced Users): If you are technically skilled and understand reverse engineering, you can create your own patches using guides and resources like:
   • https://bit.ly/2H84gwJ (Verify link validity and content)
   • https://bit.ly/32BMPNl (Verify link validity and content)

Verifying Flash Address Before Flashing:

Your RCC backup file (approximately 64-67MB) contains different partitions with various system functions. The “ifs-root” image, which contains MIBRoot, starts at hexadecimal address 0x540000 within the RCC backup.

The “ifs-root” image is further divided into two stages:

• Stage 1: Starts at 0x540000
• Stage 2: Starts at 0xBA0000

Pre-patched ifs-root.ifs files may come in two versions:

• “Full ifs-root” Image (“Mega Harman Solution”): Typically includes both Stage 1 and Stage 2 images and starts at address 0x540000.
• “Stage 2” Image: Contains only the Stage 2 image and starts at address 0xBA0000.

Determining the Correct Start Address for Your Patch:

1. File Size: Check the file size of your patched ifs-root.ifs file.

   • Full “ifs-root” (Stage 1 & 2): Approximately 19-22MB (depending on brand/firmware).
   • Stage 2 Only: Approximately 15MB (depending on brand/firmware).

2. Hex Editor Verification: Use a hex editor like HxD (https://mh-nexus.de/de/hxd/) to examine the beginning of your patched ifs-root.ifs file.

   • Stage 1 or Full “ifs-root” Image: The file should start with a specific header pattern (refer to hex editor view in original document for visual example). Also, verify the file size is in the 19-22MB range.

     Alt Text: Hex editor view showing the beginning bytes of a Stage 1 or full ifs-root image file.

   • Stage 2 Image: The file should start with a different header pattern (refer to hex editor view in original document for visual example). Also, verify the file size is approximately 15MB.

     Alt Text: Hex editor view showing the beginning bytes of a Stage 2 ifs-root image file.

     • End of Stage 2 Verification: Search for the text strings “Dashboard” and “PORSCHE” in the text portion of the Stage 2 image file using your hex editor. This is another way to confirm you have a Stage 2 image.

Flashing the Patched “ifs-root.ifs” File:

Double-check that you have selected the correct patched ifs-root.ifs file for your firmware version (MHI2_ER_AU43x_K1074_1 MU0884) and that you have determined the correct flash address based on the file type (full or Stage 2).

1. Establish RCC Telnet Connection.

2. Mount SD Card Slot 1 (SD1) for writing: (If not already mounted from backup procedure)

   mount -uw /net/mmx/fs/sda0/

3. Unlock RCC for Flashing: Execute the following command to unlock the RCC for flashing:

   on -f rcc flashunlock

   Confirm the command execution by pressing Enter when prompted.

4. Flash the Patched Image: Use the flashit command to flash the patched ifs-root.ifs file to the RCC. Replace "stage-unpacked-patched-repacked.ifs" with the actual filename of your patched file.

   • For Full “ifs-root” Image (Starting at 0x540000):

     on -f rcc flashit -v -a 0x00540000 -d -f /net/mmx/fs/sda0/stage-unpacked-patched-repacked.ifs

   • For Stage 2 Image (Starting at 0xBA0000):

     on -f rcc flashit -v -a 0x00BA0000 -d -f /net/mmx/fs/sda0/stage-unpacked-patched-repacked.ifs

   Alt Text: Putty console output showing RCC flashing command execution and progress indicators.

5. Lock RCC Flashing: After the flashing process completes, lock the RCC to prevent accidental flashing:

   on -f rcc flashlock

Copying the Patched FecContainer.fec to the Unit

After flashing the patched ifs-root.ifs file, you need to copy the modified FecContainer.fec file (containing your added FEC codes) back to the MIB2 unit.

1. Ensure SD Card (SD1) is inserted and mounted. (If not already mounted, mount it using mount -uw /net/mmx/fs/sda0/)

2. Make efs-persist Folder Writable: Mount the efs-persist folder in the RCC partition as writable:

   mount -uw /net/rcc/mnt/efs-persist

3. Copy FecContainer.fec: Copy your modified FecContainer.fec file from the SD card to the efs-persist/FEC/ directory:

   cp -r /net/mmx/fs/sda0/FecContainer.fec /net/rcc/mnt/efs-persist/FEC/FecContainer.fec

4. Set efs-persist Folder Read-Only: Remount the efs-persist folder as read-only for security:

   mount -ur /net/rcc/mnt/efs-persist

5. Restart MIB Unit: Now you can restart your MIB2 unit.

Long Coding and Adaptation Channels

After patching and FEC code modifications, you may need to adjust long coding and adaptation channels in your MIB2 unit to fully enable the desired features, such as CarPlay or Android Auto.

Example: Enabling CarPlay/Android Auto:

If you patched your system to enable CarPlay and Android Auto, use VCDS, VCP, or OBD11 to perform the following adaptations:

1. Connect Diagnostic Tool to Car.
2. Access Control Module 5F – Information Electronic.
3. Go to “Adaptation” [10].
4. Set Adaptations to Active: Set the following adaptation channels to “active”:
   • IDE03471-ENG130248-Vehicle configuration-Google_GAL,active
   • IDE03471-ENG130249-Vehicle configuration-Apple_DIO,active
   • Smartphone_interface_for_rhmi
5. Restart MIB Unit.

Consult Online Forums: For specific coding and adaptation settings related to other features, consult online forums and communities dedicated to VAG car modifications. Coding details can vary based on car model, year, and specific MIB2 system configuration.

Clearing Software Version Error After Flashing

After flashing a patched ifs-root.ifs file, you will likely encounter a “Software version management check failed” error stored in the fault memory of control module 5F. This is normal and expected.

Resetting Software Version Error:

• Using VCP Script (Recommended): VCP provides a convenient guided function script to clear this DTC (Diagnostic Trouble Code).

  1. Open VCP.
  2. Go to “Guided Functions”.
  3. Navigate to “more” -> “Clearing the DTC ‘Software version management check’ in …”.
  4. Run the script to clear the error.

• Manual Adaptation Channel Reset (VCDS/VCP/OBD11): If you don’t have access to the VCP script, you can manually reset the error using adaptation channels in VCDS, VCP, or OBD11.

  1. Access Control Module 5F – Information Electronic.

  2. Go to “Adaptation” [10].

  3. Open “IDE02502- Confirmation of installation change”.

  4. Copy Current Value: Note down the current 4-digit hexadecimal value displayed (e.g., 514E).

  5. Calculate New Value using XOR: You need to perform a bitwise XOR operation on the current value with the hexadecimal value C9D2. You can use either of the following methods:

     Method 1: “I’m So XORy” Online Tool:

     • Go to: http://mib-helper.com/im-so-xory/ (Verify link validity)
     • Enter the copied 4-digit value in the “old key” field (e.g., 514E).
     • Press Enter.
     • Copy the “new key” value displayed (e.g., 898C).

     Method 2: Windows Calculator (Programmer Mode):

     • Open the Windows Calculator app.
     • Switch to “Programmer” mode (usually under the menu).
     • Select “HEX” (Hexadecimal) mode.
     • Enter the copied 4-digit value (e.g., 514E).
     • Click the “XOR” bitwise operator button.
     • Enter “C9D2” in hexadecimal.
     • Press “=”.
     • Copy the resulting hexadecimal value (e.g., 898C).

  6. Save New Value in Adaptation Channel: Go back to VCDS/VCP/OBD11 and enter the newly calculated hexadecimal value into the “IDE02502- Confirmation of installation change” adaptation channel. Save the new value.

  7. Clear Fault Memory: Clear the fault memory in control module 5F.

  8. Check for Error Recurrence: Check if the “Software version management check failed” error returns after clearing the fault memory. It is normal for the old value to be displayed again temporarily after saving the new value in the adaptation channel.

By following these steps carefully, you can perform a firmware upgrade and patch the IFS-Root on your Audi TT MHI2_ER_AU43x_K1074_1 MU0884 system to potentially unlock new features and customizations. Remember to proceed with caution, back up your system, and consult reliable resources and communities for support.