If device has an option to manually set GPS path from "Navigation software path" option, than there is absolutely no need for ini files, I'm 100% about that. I think you may have an hardware issue and the SD cards cannot be detected by the system. Maybe there is a broken SD slot or the pins inside. I believe that you also tried with different SD cards (2 GB 4 Gb, 8 GB or 16 GB)? In some vintage wince systems there was also a problem reading SD HC standard SD cards. I had an old iGO8 running device which didn't accepted HC standard SD cards. Instead, it only worked with very old 2GB SD (none HC) card which is "unfortunately" very hard to find these days.