Hey, so I'm pretty confused about this. Most all of the tuts that I followed to downgrade one of my consoles told me to format. I dumped my sysnand as a .bin and made a backup of my original SD. Had to format both when unlinking nand. So I restored the SD backup and when I relinkd NNID to my emunand, i got my mii back but NONE of my plaza data puzzles etc. What did I do wrong? What should I do differently on my other console?
If you are only trying to set a emuNAND for CFW or doing a downgrade, doing a system format isn't necessary.
I've done downgrades on 6 O3DS units over the weekend, none of them softbricked so I hadn't to format them at all, the plaza data were preserved on those units' sysNAND.
When I've setup Gateway/rxTools emunand for those consoles, I only had to format the sysNAND (to unlink sysNAND and emuNAND) after I've finished setting up the emuNAND, so the plaza data were carried over the emuNANDs. After I've finished setting up the rxTools I removed the SD card from those 3DS and performed a system format on sysNAND, after I've done it I used Ninjhax (you can use browserhax) to setup menuhax and when it booted into emuNAND there was the Mii Plaza with all pieces that were collected, no losses at all.
On the case that you lost the "Nintendo 3DS" folders on your SD (like when my SD cards corrupted) you only have to redownload the mii plaza update (either through CIA or eShop), activate spotpass and let the console redownload the puzzles images, the progress itself is written at the console NAND, not your SD card.
TL;DR: If you performed a system format before dumping the NAND you will lose mii plaza data. If you dumped the NAND before doing a system format and used it to set the emuNAND, the Mii Plaza progress data will be preserved.
