I've have a good friend with the same problem, but not solved yet, there are many solutions to find on the Internet but no one which help you further.
I suppose you're still able to connect with you pc ? I'm afraid your bootloader is 1.0012 yes ? When you change it and use TomTom Home ttgo.bif will tell you it's 1.0012 again ?
For me I think the thing to do now is:
Start TomTom Home, reset your device, connect to your pc and get the update from TomTom Home, repeat this till there is no update more available.
Now you must have the right Navcore, patch is with FastActivate when you want to use a map from gpsu, dot the same with the map.
Read my signature for usefull information and tutorials.
Aad - pe1agp