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|
|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.|
|v65280||No||No||Stub IOS released alongside October 23rd Wii Shop Channel update|