I've done clean install on my TT Go910: installed Navcore 9.510 and map USA_Canada_1GB_925.5439
Activated with latest FastActivate with no problem.
Couple of days later I decided to add new map: USA_Canada_925.5412.
Copied folder with map on my device and tried to activate with FastActivate.
It was ".dct error" and .dct file was not generated.
I decided to try activate map with Albert's EasyActivator 6.15 (23/03/13): http://www.navitotal.com/noref.php?url=http://www9.zippyshare.com/v/97955161/file.html
It is very good program, but still no success.
Debug showed me, that no meta.txt file exist for my map. And it was surprise, because I knew that meta file already exists.
I ckecked latest inttegrated-meta.txt, which I get after FastActivate renewed it and found string with my meta:
21 8F 2D 26 0C 41 E4 F1 1A DF 5A 3B A6 B7 USA_Canada-877.meta ; USA_Canada 925_5412
So, meta was OK.
The problem was with my map: USA_Canada_925.5412. Two files caused problem: usa_canada.pna & usa_canada-877.meta
They are case sensitive. Please, be sure, that they have the same case as in meta: USA_Canada.pna & USA_Canada-877.meta
That's why both activators didn't work. After, I renamed these 2 files, everything was OK and my map was activated.