Its UNBRANDED p.o.s. from china (bought for 70$. It was working fine when I got it. My Teenager took the chip out (there are two chips. 1 for music and one for gps) she took out the gps chip and erased all information on it (firmware, software, maps etc... Its wiped clean) I tried fixing it by putting iGo maps back on, but the gps button does nothing. From youtubes that I have watched there is (folders) that I am missing. (poi, umm,,, maps and a bunch others.)
My user manual tells me nothing;
Spot #16: G-sd: gps-sd card interface, used to read gps navigation map files (9601G)

I know 100% that Im missing a file "Primo.exe" Does that help?