I've received a few likes for this post, so I figured I'd make a tread for that. Not for noobs atm, but maybe we can figure something out. In short, what you'd have to do is the following: FAT32 format your SD card so that enough space is unallocated at the beginning - 2GB should be enough for the N3DS EmuNAND. You can do this via Partition Wizard. You lose all your SD data(!). Use Decrypt9 (from my signature) to dump the NAND backup from SysNAND Use Decrypt9 to restore the previous NAND backup to EmuNAND Done! That's pretty simple, right? I think it should also be possible to do all of these steps directly on the 3DS. I haven't figured out yet how to correctly code the SD card formatter though, and HxDs open drive features doesn't help me a lot yet.