your guide worked fine, however why did you decide on restoring the NAND backups after the downgrade using the NAND backups from after the system formats rather than NAND backups from before the formats?
I ended up restoring "sysnand.bin" as my EmuNAND (as I wanted EmuNAND) then "sysnand_original.bin" as Sysnand so I could retain my NNID, purchases, and installed games on my N3DS XL.