used fast img unlocker, but that image is not working in my garmin gps device (c330), but when opened that img in gmaptool, it shows its unlocked. so I just split the original approx 229 mb file in gmaptool and then joined all the IMG files back into one gmapsupp.img (which turned to be 171736 KB only), copied that to the SD card, put it in C330..it works ..not sure why it does not work as it is with the 229 mb unlocked img..