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IOS16 was originally a leaked IOS from Nintendo's Wii Backup Disc. When Nintendo went to fix the fakesigning 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 fakesigning bug. It was then pirated to downgrade prior to the System Menu 4.0 update, primarily to assist in piracy.

Version Signing bug? STM Release Exploit? Notes
v257 Yes Yes Leaked from Nintendo's Wii Backup Disc
v512 No No Stub IOS released alongside System Menu 4.0