Did you try with the original locked map in your SD inside a Garmin folder ? If DNX7100 works the same with DNX7200 it will ask you for the license key after reading the map. You can create a license key for your device based on it's UnitID and map's FID, type it once and you're OK ...
DNX7200 is having problems with unlock map Auto Drive (it couldn't read the map) but it works great with the original locked map and the license key.
Just a thought, hope it helps.
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