Thread: "Cannot unlock maps" error after reboot on 3790T

Originally Posted by catymag

Nuvi remembers unlock codes ,even if you deleted unlock files ,till next sw update or reset.
Probably,you need to replace missing original .unl file and .gma to have your original maps displayed on Nuvi.

Thanks for that catymag, unfortunately I don't have a full backup of the files prior to this so I'm guessing replacing isn't an option. Any other thoughts most welcome