I was just wondering if you havent lost your device ID in NV coz you get the locked maps warning.
Check in GarminDevice.xlm if these infos(here XXXX) are present:

-<Model><PartNumber>010-00XXX-XX</PartNumber><SoftwareVersion>XXX</SoftwareVersion><Description>nüvi XXXX</Description></Model><Id>XXXXXXXXXX</Id><RegistrationCode>XXXXXXX</RegistrationCode>-<Unlock>

PS: dont post them on forum if you have them ok