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Technical info
TypeSpecial IOS (v257)
Anti-Homebrew Stub IOS (v512)

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.

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 Installed by the Wii Backup Disc
v512 N/A N/A Stub IOS released alongside System Menu 4.0