I found a few topics with similar problems but they are very old and usually don't solve the problem.
Problem:
I have bought an 32x with TopoActive EU Maps installed. The Maps have been updated and i had to buy a 32gb SD card for the update to fit. Everythinbg worked fine.
The first few times i have plugged the device in, Basecamp read the maps (One on device, two on SD card. It takes ages...) and i could use them. But now basecamp only shows one map on my SD card and it says "no valid map product" (in German, don't know what appears in english setting).
Anyone can help me out?