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Technical info
TypeCommon IOS

IOS15 contains the "NAND BOOT PROGRAM" AKA "NANDloader". This was probably accidental.

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.

The only titles using this IOS are older versions of the Wii Shop Channel, Forecast Channel, News Channel, and Internet Channel.

Version Signing bug? ES_Identify / /dev/flash? STM Release Exploit? Notes
v257 Yes Yes Yes First release
v258 Yes Yes Yes
v259 Yes Yes Yes
v260 Yes Yes Yes
v265 No No Yes
v266 No No No
v523 No No No 4.2 update
v1031 No No No 4.2rev04 update. In addition to the fixes to all IOSes, the NAND boot program was removed.
v1032 No No No
v1288 No No No Only found on vWii and newer RVL-101 units.