Perhaps the R4 forum is a better place to post this: It would be o-so-cool to be able to write my own firmware for the M3/R4... Plus it seems that the only differences in the two firmwares so far are they check to make sure they are running on the right card. So it would be nice to have a homebrew firmware that doesn't check (and could be used for both cards) and that more features could be added to. im still a noob to the homebrew stuff, but to me it seems that the firmware must consist of some arm7/arm9 code and all the other files just like any NDS rom? just for the hell of it i tried to get at them using ndstool... but i don't think that was the right direction to go in... does anyone have any ideas about this? or some piece of information that could point me in the right direction?