IOS16


IOS16 was an IOS, installed and used exclusively by the Wii Backup Disc. When Nintendo went to fix the signing bug in all versions of IOS, they didn't think to release an updated version of IOS16, since it was never publicly distributed.

IOS16
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Technical info
TypeSpecialized IOS
StatusPrivate Corporate IOS

After that update, IOS16 was left as the one last IOS with the unfixed signing bug. It was then unofficially released and used to downgrade the System Menu prior to the 4.0 update, primarily to assist in piracy.

Version Signing bug? STM Release Exploit? Notes
v257 Yes Yes Present in the update partition of the Wii Backup Disc
v512 N/A N/A Stub IOS released alongside System Menu 4.0