Hi, the map is unlocked and I am still getting that popup message. I also have the same structure but I do not have the .unl file for gmapsupp.

Unfortunately I have no receipt. The owner is a friend of mine who bought it a year ago from kijiji for $75. He used it until it stopped loading maps and I cure it. BTW, I sent an email to Garmin and still waiting. I unlocked the unclocked image with Fast IMG unlocker but no luck