Are you sure the .img is gmapsupp.img and not gmapsupp.img.img? Enable hidden estensions in Windows to check it.
As said ,if the map is unlocked with last version of FIU (previous ones can fail), it's correctly named gmapsupp.img and copied in Nuvi root internal memory ( not in a Garmin folder) , Nuvi will see it.
Can you post a screen of your Nuvi with files extensions enabled ? please
PS: as said in the post above mine, after loading a cure you must reflash the normal firmware in Nuvi or it wouldnt see any IMGs ,coz the cure is made for that: not to load wrong problematic IMGs -
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