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IOS12 is the oldest known version of IOS. It was probably developed to be used in Wii Demos and product showcases. It is only known to have one function, which is to control the Bluetooth functonality of the Wii and Wiimote.

Version Signing bug? STM Release Exploit? Notes
v6 Yes Yes First release. June 4, 2006
v11 No Yes
v12 No No
v269 No No
v525 No No
v526 No No