Wii 4.3 NAND Formatters!
These formatters erase your entire Wii's NAND flash (except boot2) and reinstall the minimum required to boot the System Menu. They are very useful for returning consoles to a unmodified state, just "starting fresh", region changing, and even fixing random freezing.
Use with caution! These can brick your Wii if not careful. Read the included README for more info and instructions!
NAND Formatter by Comex