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|Type||Anti-cIOS Stub IOS|
IOS 254 is commonly used for various purposes:
- BootMii as an IOS, is installed to this slot.
- 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.
- System Menu 4.2 included a Stub IOS in this slot, in an attempt to overwrite BootMii/IOS, but if failed, because the version number wasn't high enough.
|Version||Trucha Bug?||STM Release Exploit?||Notes|
|v2||No||Yes||Included in 3.4 update to block PatchMii (copy of IOS9).|
|v3||No||No||Included in 4.0 update to fix the STM Release Exploit.|
|v260||N/A||N/A||Stub IOS in 4.2 update to wipe out BootMii/IOS (failed) 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|