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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 probably to make [[error 001]] appear in older games, as a lot of games use IOS21.

'''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.

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.

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.