I'm getting ready to downgrade my brother's and sister-in-law's 3DSes and was wondering if there was a way for me to make NAND backups of their SysNAND before going through with the downgrade. Essentially, what I want to do is downgrade without them losing their progress in Mii Plaza, etc. The idea I had in mind was to take a backup of their current NANDs and use that for the EmuNAND in an unlinked setup. If that can't be done, then is there a way I can do the downgrade without losing their current progress? If I can get it back to 9.2 without losing progress, then I can just use that as the base for EmuNAND.