Agggghhhh! Don't treat a Garmin img file that way. It's a Garmin proprietary file format, not a 'normal' img file at all. Don't do anything with it after decompressing it, only unlock it. If you don't have a Garmin device, just put the *.img file [name it gmapsupp.img, that ALWAYS works] in a Garmin folder on a card, usb stick or virtual SD as i said.

Mumble, grumble, rhubarb, mutter .... Goddam Mexicans, dona speaka da enklish proper .....