Changes

'''IOS15''' was previously used by some official channels; it has not been stubbed because the [[Internet Channel]], which could not be updated through standard updates, previously used it.

'''IOS15''' was previously used by some official channels; it has not been stubbed because the [[Internet Channel]], which could not be updated through standard updates, previously used it.

Some versions of IOS15 contain a copy of the [[SDK]] with [[error 001]] code; the purpose of this is unclear, as IOS15 was not used by any discs. This was introduced in IOS15v258, built 6 minutes before IOS21v515, suggesting that there was a miscommunication regarding which [[IOS]] was supposed to receive this update, since [[IOS21]]'s hex ID is 1-15, which may be read as IOS15. This only added 624 bytes to IOS15 and 649 bytes to IOS21's [[Starlet]] binary, so it was probably a trivial change in the code to load content 3 of the current IOS instead of the boot content of the [[title]] being launched, and perfectly doable in 6 minutes.

Some versions of IOS15 contain a copy of the [[NAND Boot Program]] with [[error 001]] code; the purpose of this is unclear, as IOS15 was not used by any discs. This was introduced in IOS15v258, built 6 minutes before IOS21v515, suggesting that there was a miscommunication regarding which [[IOS]] was supposed to receive this update, since [[IOS21]]'s hex ID is 1-15, which may be read as IOS15. This only added 624 bytes to IOS15 and 649 bytes to IOS21's [[Starlet]] binary, so it was probably a trivial change in the code to load content 3 of the current IOS instead of the boot content of the [[title]] being launched, and perfectly doable in 6 minutes.

In the past, this IOS was often used by homebrew, as it is one of the only known IOSes that is safe to downgrade on [[RVL-CPU-20]] Wiis. It was then used to patch the [[signing bug]] back into newer IOSes, like [[IOS36]].

In the past, this IOS was often used by homebrew, as it is one of the only known IOSes that is safe to downgrade on [[RVL-CPU-20]] Wiis. It was then used to patch the [[signing bug]] back into newer IOSes, like [[IOS36]].