Give this a try:

-First make a backup of your device.
-Remove old map from device.
-Copy new map to device (make sure the meta of this map is avaliable)
- Put meta.txt file with correct meta in root device.

-Run fastactivate (as Administrator)
Temporarely disable your antivirus if necessary
-Option 3 (Patch navcore) and wait for the message Navcore OK system patched or navcore already patched if already done)
-Option 2 (patch maps, voices etc)
Quit (left downcorner)

Remove device safely from pc, give it a reset and startup again.