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In the past, IOS15 was often used by homebrew, as it is one of the only known IOSes that is safe to downgrade on LU64+ Wiis. It was then used to patch the signing bug back into newer IOSes, like IOS36.

Version Signing bug? STM Release Exploit? Notes
v257 Yes Yes First release
v258 Yes Yes
v259 Yes Yes
v260 Yes Yes
v265 No Yes
v266 No No
v523 No No
v1031 No No
v1032 No No