I figured out how to add the necessary FEC to enable map updates on my 2020 eGolf 9.2" MHI2 MIB2.5, and thought I'd post some details here in case anyone else has the same issue. What I did was:
Thanks again to everyone here for pointing me in the right direction to get this working!
- Prepare a 4GB SD card with M.I.B. downloaded from here (https://github.com/Mr-MIBonk/M.I.B._More-Incredible-Bash).
- Add the patches to the SD card; the patches are downloaded separately from the M.I.B. utility (patches were from mibsolution.one).
- Check the individual folders inside the patches folder to make sure there is one for the exact Software Train Version of the unit in the car. In my case, I had Software Train Version MHI2_US_VWG13_P3662_1 but there was only a patch for MHI2_US_VWG13_P3662 (without the _1), so it would not work. I contacted one of the M.I.B. developers and they told me it was safe to rename the patch folder on the SD card to just add the "_1" so that it matched the version of my car.
- Still in the patches folder, inside the folder for the appropriate software train version, look for the file addFecs.txt and make sure this file contains the new FEC(s) to enable (e.g. 09310099 for map updates).
- Now that the SD card has all of the necessary things on it, install M.I.B. exactly according to its instructions. There are 3 steps: Install, then do a backup, then select "Flash Patched Image | Add FECs | CP/AA Coding".
- If this succeeds, the new FECs will be working! I checked in the service mode menu under 'Installed Codes' and the new FECs were showing there.
Thanks again to everyone here for pointing me in the right direction to get this working!