Changes

| stubvariant = Unique

| stubvariant = Unique

}}

}}

'''IOS254''' is commonly used for various purposes:  

'''IOS254''' is commonly used for various purposes:  

* The [[4.3]] update included a [[Stub IOS]] in this slot, in an attempt to overwrite BootMii/IOS, which succeeded for BootMii versions earlier than 1.4. Versions 1.4 and above use version 65281 to prevent this.

* The [[4.3]] update included a [[Stub IOS]] in this slot, in an attempt to overwrite BootMii/IOS, which succeeded for BootMii versions earlier than 1.4. Versions 1.4 and above use version 65281 to prevent this.

[[Revolution OS]] contains code that cancels the [[error 001]] checks if the current IOS is below IOS30, or is IOS254 or higher. Both of these checks existed in late 2007 (seen in the [[IOS21]] [[NAND Boot Program]]), before BootMii/PatchMii was released, which may mean there is also a real IOS254 used internally (possibly v0/v1).

[[Revolution OS]] contains code that cancels the [[error 001]] checks if the current IOS is below IOS30, or is IOS254 or higher. Both of these checks existed in late 2007 (seen in the [[IOS21]] [[NAND Boot Program]]), before BootMii/PatchMii was released, which may mean there is also a real IOS254 used internally. On top of this, v2 uses content ID 1, so there must have been a version before it, most likely v1.

== Titles using this IOS ==

== Titles using this IOS ==

== Version history ==

== Version history ==

{{IOS version history|

{{IOS version history|

{{IOS version|v2|identify|Included in 3.4 and 3.5 updates to block [[PatchMii]] (copy of IOS9v520).}}

{{IOS version|v2|identify|Included in 3.4 and 3.5 updates to block [[PatchMii]] (copy of IOS9v520).}}

{{IOS version|v3|stm|Included in [[4.0]] update. Copy of IOS9v521}}

{{IOS version|v3|stm|Included in [[4.0]] update. Copy of IOS9v521}}