Hi Tempers, When I installed the M3i Zero the first time everything worked fine: I copied the F_CORE.dat and the SYSTEM folder on my SD Card, put it into the adapter and this one with little USB-cable into PC, LED blinked and my NDS lite finally recognized the M3i Zero. Since around a week my NDS doesn't recognize the M3i anymore: After switching it on it just says "There is no DS Card inserted." I tried to insert the SD Card without deleting any files into another M3i Adapter (the one of my sister) - and it worked. So I think there's a problem with my Adapter, not the SD Card. Of course I tried to flash the M3i again with that F_CORE.dat-file, i reformatted the SD card (FAT32) and copied the SYSTEM folder again to SD Card. But everytime I try to flash the M3i by putting the USB-cable into the PC, the LED just glows permanently. It doesn't blink anymore, although I tried F_CORE.dat alone on SD Card root as well as F_CORE.dat plus SYSTEM folder as well as an older F_CORE.dat. The LED just shines continuously, without stopping! Thanks for your help!