To properly use a ROM on older flashcarts like Gateway or Sky3DS , you must use the .3ds file format, which acts as a direct dump of the physical cartridge. This differs from the modern custom firmware (CFW) standard, which uses .cia files for installation directly to the 3DS home menu. Device Setup and Requirements Flashcart Compatibility :
: Requires the console to be on an older firmware version (typically 4.1–9.2) to launch its specialized "Gateway Mode". Mario Kart 7 3DS ROM (EUR/USA) (Gateway/Sky3DS )
: These cards emulate a real cartridge and generally work on any system firmware. The Sky3DS+ (orange button) is highly recommended for its simple drag-and-drop functionality. To properly use a ROM on older flashcarts