Some devices can be updated successfully with no problems but others prove to be unstable so it's better to use the official navcore.
The official TT specs for your device should be:
Bootoader: 5.5022 = Ok
Navcore: 8.016
1. Personally I would do a full backup & then wipe the device and start again using the official TT navcore 8.016 which you can download from
[Please Register or Login to download file] 2. After installation, start it up until you see the 'no maps found' message
3. Install & activate Iberia 1055.10415 map and then patch the new navcore with FastActivate option 3
4. Disconnect & test