If you have a hard-bricked Wii (especially one with a corrupt system menu or missing IOS), a clean NAND backup from a similar console region (e.g., NTSC-U, PAL) can be restored via BootMii or a hardware programmer like the Teensy++ 2.0 . Archive.org provides a library of “virgin” NANDs that have saved many seemingly dead Wiis.
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Navigate to the (gears icon) using a GameCube controller or the front console buttons. If you have a hard-bricked Wii (especially one