Searched, and read entire post...can't get this to work on my nuvi 200w:

Downloaded unlocked img
got Sandisk 2gb (non SDHC) and reformatted using FAT
made garmin directory on sd card
renamed to gmapsupp.img on sd card
device does not see the new map...tried renaming one on device to .bak, then it says no maps available

any help would be great

BTW, the unlocked img works fine on my 765T so the file is not corrupt