this is not mapsource is IMG
have you red this
just download and renamed it to gmapsup2.img.Put the two files (gmapsupp.img and gmapsup2.img into Garmin folder on your device) and generated two unlock files for it (it should be gmapsupp.unl and gmapsup2.unl).Otherwise you can use gmaptool to combined both map into one single gmapsupp.img
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