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'''IOS21''' is most commonly used by third-party games. It also contains the [[NAND Boot Program]] developer tool, just like [[IOS15]]. Most debugging messages have been removed, though.

'''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 older versions of DataChk, a factory title.

This [[IOS]] was used by some versions of DataChk.wad, a factory title, as well as NDEV Menu v1.11.

== Version history ==

== Version history ==

{{IOS version history|

{{IOS version history|

{{IOS version|v512|none|Lowest version released, but not the first release. Released on Mario & Sonic at the Olympic Games in November 2007.}}

{{IOS version|v512{{check}}|none|Lowest version released, but not the first release. Supposedly released on Mario & Sonic at the Olympic Games in November 2007. Possibly just a typo for v514 when reporting it.}}

{{IOS version|v514|none}}

{{IOS version|v514|none|First release; [[2.2]] update. Most likely forked from [[IOS19]]v513, since the KD code comes from there.}}

{{IOS version|v515|none}}

{{IOS version|v515|none|Added [[NAND Boot Program]], updated [[Starlet]] binary}}

{{IOS version|v516|none}}

{{IOS version|v516|none|Reverted to v514 (new build tag)}}

{{IOS version|v517|none|First release; [[2.2]] update}}

{{IOS version|v517|none|Added back the NAND Boot Program, and updated the Starlet binary (different from v515 and v516)}}

{{IOS version|v522|identify}}

{{IOS version|v522|identify|Standard [[3.3rev03]] changes. Since this uses an [[ES]] module common to all IOSes before [[IOS37]] in this update, the NAND Boot Program is no longer loaded for the Internet Channel, although the NAND Boot Program itself was not removed.}}

{{IOS version|?|identify|Only known to exist because content IDs A and B are skipped. Version number is not known.}}

{{IOS version|v525|stm}}

{{IOS version|v525|stm}}

{{IOS version|v782|stm}}

{{IOS version|v782|stmioctl}}

{{IOS version|v1038|stm}}

{{IOS version|v1038|sdireg}}

{{IOS version|v1039|stm}}

{{IOS version|v1039|sdireg}}

{{IOS version|v1295|stm|Only found on [[vWii]] and newer [[RVL-101]] units.}}

{{IOS version|v1295|sdireg|Only found on [[vWii]] and newer [[RVL-101]] units.}}

{{IOS version|v26895|stm|Only found on [[Wii mini]]}}

{{IOS version|v26895|sdireg|Only found on [[Wii mini]]}}

}}

}}

{{Navbox IOS}}

{{Navbox IOS}}