I got an old ds lite and a m3ds real card that has the m3 sakura logo on it too. put the "system" folder on a 16gb sd card, boot up the ds, long press "a" and the only thing it says is the logo at the bottom right corner, "[EN_V1.1_V3]" at the other corner and "slot 1 nds" in the middle. i tried...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced