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'''IOS21''' is most commonly used by third-party games. It also contains a copy of the [[NAND Boot Program]] in content 1 in some versions, identical to the one in [[IOS15]]; this was most likely to apply an urgent patch to the Internet Channel.

'''IOS21''' was an IOS used by third party games that has an updated [[STM]] module. It also contains a copy of the [[NAND Boot Program]] in content 1 in some versions, identical to the one in [[IOS15]]; this was most likely to apply an urgent patch to the Internet Channel.

It probably had the connection fixes advertised for [[2.2]]. Many games such as Wii Sports were also rereleased under this IOS with a newer strap screen, probably in response to TVs getting smashed.

Many games such as Wii Sports were also rereleased under this IOS with a newer strap screen, probably in response to TVs getting smashed.

This [[IOS]] was used by some versions of DataChk.wad, a factory title.

This [[IOS]] was used by some versions of DataChk.wad, a factory title.