My brother has an R4 and M3 Perfect. He wants to use his M3 Perfect to link DS and GBA games. Of course, he will need to boot his M3 Perfect in DS-mode. But he has only got one SD-card. The R4 won't work without one. When removing it to get the SD-card out the menu will crash. I was wondering: is there any way (homebrew maybe?) to boot his M3 Perfect in DS-mode? Btw, he doesn't want to flash his DS.