What's with this map (in the original post)? I did everything I could (even formatted SD card), but every time I boot GPS, I got the error:

Maps are corrupted and cannot be used
Go to
Link URL:
Only the registered members can see the Link URLs. Please Login OR Register.
to
download the latest maps

and the map does not show up in myMaps. As soon as I delete the map from SD, GPS boots without errors.
Does the map even work on Zumo XT? And yes, I renamed the file to gmapsupp.img