The stock card included with the FC3000 is notorious for failing. Use a branded SD card (Sandisk, Samsung) to prevent data corruption.
Before downloading anything, you must identify your hardware. There are two main versions of the FC3000: fc3000 custom firmware
Stock firmware restricts you to a handful of systems. Custom firmware opens the door to Game Boy Advance (GBA), Neo Geo Pocket, WonderSwan, and various arcade cores. The stock card included with the FC3000 is
Better screen brightness controls, audio settings, and the ability to map buttons properly. Neo Geo Pocket