Hi, I've read that you can or at least they say that the colorado now doesn't have any restrictions on that image names but I can only get it to read sd_card\garmin\gmapsupp.img whatever I rename it to it doesn't work. In the sd card I have
garmin\spain.img (topo unlocked)
garmin\uk.img (city navigator unlocked)
none recognized. I have colorado 300 software version 3.40
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