Just a recap on the update process for the Maps from my side since i first experienced some failed attempts.
From a prior post on this thread:
0. Take a complete back up of the existing map card to the hard disk
1. Reformat the SD card that had xxxx on it
2. Copy the freshly dowloaded yyyy version to the SD card (with 7zip preferably to unpack) same file structure needs to be kept, not one down etc.
3. Replace /maps/EEC/EEC_WLD/OVERALL.NDS on the SD CARD with old one from your HD backup
Possibly additionally:
In my case the original MAPS version had the folder /maps/22/... on the SD card, where the newer MAPS had the folder /maps/00/... In order to make the new MAPS work, just rename the folder from "00" to "22" (or whatever number your original MAPS carried). Apparently the headunit and the linked uniquely coded files refer to map locations as well.
I updated MAPS to version 1115 successfully from 0521 on a retrofitted MIB2 unit (upgraded from 5F0035858A to 5QA035858A since I wanted CarPlay available).
Other option to update is btw to use DiscoverCare from VW (after changing the folder name to "00", otherwise the software tries to add a new folder instead of replacing the existing one). Please be aware to always make a backup first of your SC card!!!