During map update process map update tool hangs, and after kill process from task manager restarted Nuvi 3790 goes into loop "Loading Maps" After long game with cure firmware i found, that if i change 30 00 3A 00 2F to 00 00 3A 00 2F device enters in to PC connection mode. Unfortunately, computer doesn't recognize it as Mass Storage device Anyone, any suggestions what i need to do now?