TT One New Edition gives 'No Maps Found' error....

Hello There,
I've updated many Tomtom maps already on different devices, but the TT One New Edition I'm trying to update gives a 'No Maps Found' error message, even with maps that work on other TT devices.
I've tried:
- reformatting the device, and reinstalling TT with TT-Home, same issue.
- do a filecheck on the device: same issue
- reinstall the old map that used to work: same issue (so even that one doesnt work anymore)

Is there anybody who knows how to solve this? I mean: even if the FastActivate doesn't work, the device should still say it sees maps, but can't use them...

Any help would be appreaciated!

Mod edit: Removed email address.

If installed correctly and activated with a valid .dct file present they will work if the NC is patched.
No maps found usually means map files are missing or the files are not located in the correct spot.