what are the differences with navcore 7.917 and 7.45? where can i get 7.917 without prompting for map code.? i did tried 7.917 but that must be a unhacked version, prompting for the map code which i don't have. then i tried 7.918 but "..not compatible.." pop up. not enough memory? my device is glofiish x800 64 ram and am using 7.45 presently with 850..map.