Nand backup freezes and this happens : r/WiiUHacks
BootMii Backup stuck on a block? | GBAtemp.net - The Independent Video Game Community
Problem with NAND backup (Wii u) | GBAtemp.net - The Independent Video Game Community
Damn, my Wii only has a single bad block in its NAND. : r/WiiHacks
Cannot access the Wii menu after importing my NAND backup from my Wii U - Wiimmfi (English) - Wii-Homebrew.com Forum
Backup NAND with BootMii | wiiwild
Haku33 - Switch NAND Cleaner / Restore Stock OS without Backup - CFWaifu
I think I hit the NAND lottery. Found a Wii for $5 today and it only has one factory bad block. Picture of my older Wii included for comparison. : r/WiiHacks