I'm not sure about mass storage mode, i think, that you are right about it. maps and other data synchronising with mapsource.. i don't bother about erasing regions with nv memory and map memory. Are there any thoughts about ways of erasing this regions? p.s. 4.80 firmware have one instance of "img" hex value is 69 6D 67. other instances are "diskimg" and one instance with ".iMgL(."