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IOS4 was a very primitive IOS that was probably used during the manufacturing process. Consoles requiring the Wii Startup Disc also use IOS4 as the System Menu IOS. Not to be confused with that used on other products.

Version Signing bug? STM Release Exploit? Notes
v0 ? ? Found in leaked files from BroadOn
v1 ? ? Remnants of this Version were found in the leaked 'Wii Startup Disc' Nand
v3 ? ? Initial release. Present on Wiis with the 'Prelaunch/Wii Startup Disc' system menu.
v259 N/A ?
v65280 No No Stub IOS released alongside October 23rd Wii Shop Channel update