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Technical info
TypeAnti-cIOS Stub IOS

IOS 254 is commonly used for various purposes:

  • PatchMii uses this as a temporary IOS
  • System Menu 3.4 included a copy of IOS9 as IOS254 to block PatchMii (and maybe to break some pirate tools), but Nintendo replaced the wrong IOS number, since most pirate tools use IOS249.
  • BootMii as an IOS is installed to this slot.
Version Trucha Bug? STM Release Exploit? Notes
v2 No Yes Copy of IOS9 in 3.4 update to wipe out installed cIOS
v3 No No Included in 4.0 update to fix STM release exploit
v260 N/A N/A Stub IOS in 4.2 update to wipe out BootMii-IOS and reduce the number of IOS branches to be maintained
v65280 N/A N/A Stub IOS in 4.3 update to wipe out BootMii (IOS) and prevent its installation