I successfully downgraded my buddy's New3DS using this GUIDE and it was working just fine until his little brother started screwing with it and used TinyFormat and ended up formating his Luma3DS. Homebrew is still functional but he can no longer open the luma updater without getting a black...
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)
@BakerMan:
although i ended up accidentally changing my nand with no way of going back bc i didn't know you...