Imagine that you have a game on a bought cartridge (ex. Mario Kart DS), and you have in your PC the ROM of any other game (ex. Pokemon Diamond) as a .nds format. I know ways to get the Mario Kart DS to my PC as a .nds file, but anyone know how to replace the content of the cartridge to have in the cartridge Pokemon Diamond instead of MKDS? I have a 3DS with HBW, if necessary.