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I got the gmapsupp.img (I think it is) properly installed on the SD card in my GPS device but when I boot the device, I get a message about maps are locked and they cannot be viewed. I've read through the install instructions (from a Mac to the device), have confirmed MapInstall and my GPS are completely up-to-date, and have tried installing several different state topos downloaded from the GPSFileDepot. How do I get the maps unlocked, thus visible on my GPS device?