since GW team has been able to emulate nand on sdcard and run it on3ds, that means that the inverse is possible right? having 6.x as main firmware and 4.5 as an emulated nand on sdcard. now, i know that every 3ds has its own "secret" code. but it is present on the card if each 3ds should compile its own emulated nand. i don't know if this is possible but can the 3ds partially run it's firmware from both 3ds and sdcard ?let me explain myself : 6.x 3ds ==> sdcard with 4.5 emulated nand synergy between 3ds and card, run custom 4.5, and gives acces thanks to the genuine 6.x. i don't even know if what i'm saying is possible, and you guys will probably laugh you arses off by the potential pile of crap i tried to explain, but heck, it's just an idea.