mib2-toolbox turns an SD card into a developer menu for a VW head unit

What lands on the head unit is a menu, not a firmware mod

The project describes itself as a toolbox for the MIB2 High platform, which is the infotainment hardware used in certain Volkswagen Group cars, and the thing it installs is a menu tree. The README prints the whole tree, and it is the most useful page in the documentation because it is a complete inventory of what you get. Under Customization there is an Adaptations branch with entries such as CarDeviceBUSAssignment, CarFunctionsList_BAP, CarFunctionsList_CAN, CarMenuOperation, HMI_FunctionBlockingTable, RCCAdaptions, VariantInfo, VehicleConfiguration and WLAN, and alongside it the Advanced, AndroidAuto, Coding, Display, GreenMenu, Language, Navigation, Privacy, Skin, Sounds, Startup, Updates and Various screens. At the top level there are also Disclaimer, Dump, History, MIB_Information, which contains a Password entry, and Uninstall. The Coding screen is a long coding editor, and the navigation screen covers map style switching.

The hardware requirement is narrow and the warning is up front

The first thing the documentation does is tell you when not to bother. The unit must be an MIB2 HIGH or an MIB2.5 HIGH infotainment unit, and it will not work on MIB1 or MIB2 Standard units, and the text is careful that Discover Media and Composition Media are not MIB2 High, with a pointer to a separate toolbox project for owners of the standard unit. The second note says this is not a universal jailbreak-like solution for all needs and firmware versions, which is a real constraint given that the releases stop at v4.1 from 2021. The third is a risk statement: the screen has the potential to ruin the MIB2 High unit, the developers accept no responsibility, and the author adds that they have risked bricking their own hardware while testing. The stated requirements are also practical ones, an empty FAT32 formatted SD card with more than a gigabyte of space, somewhere to keep backups, and optionally Python 3 if you want to work with graphics containers.

Installation runs through the unit's own software update screen

The normal install path uses the head unit's own update mechanism, which is a neat trick and the reason the toolbox needs no special tooling. The steps are these. Clean the SD card first if you had a version from before V4.0 on it, then put all the files and folders from the repository onto the card, either by cloning the repository or by downloading the zip and extracting it. Insert the card into one of the unit's slots, and make sure only one card is inserted, because the scripts do not know where to look otherwise. Then hold the MENU button until the service screen appears, choose Software updates and versions, and press the Update button in the top right corner. Select the SD card and select MQB Coding MIB2 Toolbox. The unit runs the update and reboots several times, and you will see a screen listing many modules as N/A with the Toolbox line showing Y, at which point the back button in the top right corner returns you. It then asks you to connect a computer to clear the error codes, which the documentation says you can skip with the Cancel button, and the unit restarts one final time. Hold MENU again and go to TESTMODE, or on older units to the developer menu by holding MENU for about ten seconds, and find the Green Developer Menu. If a new menu called mqbcoding is there, the install worked.

The manual path goes in through the debug console

There is a second route for anyone who cannot or does not want to go through the update menu, and it uses the debug console of the head unit. You put the toolbox on an SD card and insert it into the SD1 slot, then connect to the unit's debug console, either with a D-Link Dub-E100 or an ASIX AX88179 adapter on the USB port, or through the serial interface on the back of the unit, and log in. With the card mounted, you run the final script:

mount -uw /net/mmx/fs/sda0
sh /net/mmx/fs/sda0/Toolbox/final/finalScripts.sh

The path tells you where the unit sees the card, and the second line runs the installation script from it. After that the same TESTMODE and Green Developer Menu steps apply, and the mqbcoding entry is the confirmation that it worked. This route is the one to prefer if you want to understand what the update menu does for you, since it shows the script that the menu would otherwise run behind the scenes.

Skins, startup graphics and the Android Auto patch

The screens that do visible work are described concretely, which makes them easy to judge. The Skin screen installs new images.mcf files for each of the six skin folders, taking them from the SkinFiles folder on the SD card, and the documentation tells you to use the dump files as a guideline and, in strong terms, not to install files meant for other firmwares, because that will mess up the graphics and the functionality of the unit. The same screen can restore the skins from a backup. The GreenMenu screen imports new .esd files from the GreenMenu folder on the card, and the Startup screen handles the startup graphics, which is where the canim containers come in. The Android Auto screen has two buttons, one to patch Android Auto so that custom third party apps work without root on your phone, and one to recover the original gal.json if the patch is not what you wanted. The Dump screen exists to write the unit's own data to the card, which is how you produce the files you would then modify.

The Tools folder holds the Python scripts

The repository carries a Tools directory with Python scripts, the first of which is extract-canim.py, and the documentation describes them as tools that extract startup screen files, the.canim containers, in two formats. This is where the optional requirement of Python 3 comes in, since you only need it if you want to extract and compress graphics containers, and the optional requirement of a text editor appears if you want to write your own green menu files or scripts, and of picture editing software if you want to customise the graphics files. The rest of the tree explains the project's structure. There is a Toolbox directory, which is what ends up on the card, a Custom directory, a Modifications directory, a Research directory for the research behind the work, a FAQ file, and a metainfo2.txt file.

Licence, versions and the request not to profit from it

The repository is under the MIT licence, which allows reuse and redistribution as long as the copyright notice is kept, a notable contrast with the request in the documentation. The README asks businesses that try to profit from the project not to charge money for it, explains that the work was done in free time out of love for the community, mentions the author has risked bricking their own hardware and invested a lot of time in the research, and asks for support in the form of knowledge, a small donation or a Patreon pledge instead of money. The release history shows how little has changed recently, with v4.1 in February 2021, v4.0 in January 2021 and v2.2B in February 2020, while the last push to the repository was on 2026-08-24, so the code moves but the published version numbers have not moved in a long time. For anyone deciding whether to use it, that is the trade to weigh: a mature feature set with an old release line and a warning from the author that the wrong firmware and the wrong files can ruin the unit.

Editorial conclusion

mib2-toolbox suits a Volkswagen owner with an MIB2 High or MIB2.5 High unit who wants the hidden adaptation channels, long coding and skinning options that the factory menu does not expose, and it suits someone who wants the installation to be reversible, since the toolbox ships an uninstall entry and a dump screen for taking backups first. It is a poor fit for any other head unit, since the README rules out MIB1 and MIB2 Standard units outright and points those owners to a different project, and it is a poor fit if you are not prepared to accept a bricked head unit, because the authors warn in the first line of the documentation that the screen can ruin the unit. Before you start, check three things: which unit you actually have, since Discover Media and Composition Media are not MIB2 High, that you have an empty FAT32 formatted card of more than one gigabyte, and that you have made backups, since the dump screen exists precisely to produce them.

Frequently asked questions

Official sources

1. Issues
2. jilleb/mib2-toolbox on GitHub
3. License: MIT
4. README
5. Releases