The .unl depends on .img FID so old one not only is useless ,but it would give a false information to your device, same for the .gma. So with a different map ,and especially if it's unlocked ,it must be removed.
Check if the map is unlocked , if not ,unlock it and replace the old one after having backupped it along .unl and .gma in your pc.
If sd ask for a pass try to add the sw.unl for the sd ID ,I've read in the net it works in Honda units, it's similar to unlock GMXT
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