IOS4

IOS4
Release
Initial	boot2v0
System Update	3.3rev03
Technical info
Type	System Menu IOS
Status	Private Corporate IOS
Stub variant	2008

IOS4 was a very primitive IOS that was used by both the Startup Disc Menu and the System Menu used in the factory process. This IOS and the System Menu come preburnt at the factory, before any other discs are inserted.

Like IOS10 and older versions of IOS9, this IOS does not have a build tag.

U.S. update partitions are set to use this IOS in their TMD. Other regions are not yet known.

IOS3 and IOS4 are also the only two IOSes stubbed on the Wii mini, since most IOSes will hang on the Wii mini due to the WiFi module not responding.

The SDK version that uses IOS4 probably only supports 4:3 video; this is evident in the Wii Startup Disc's SDK, which most likely uses IOS4.

Titles using this IOS

• Factory System Menu
• Unknown 123J disc
• Startup Disc Menu
• Wii Startup Disc
• Update partitions
• iplKitayamaTest dummy

Version history

Version	Signing bug?	/dev/flash access?	ES_Identify?	STM Release Exploit?	STM IOCTL overflow?	SDI register index bug?	Notes
v1	Yes	Yes	Yes	Yes	Yes	Yes	Used by older versions of the Factory System Menu and 0000. Uses CID 35016B91, which is -CAFE946F. The significance of this CID is unknown, but it seems like CIDs are considered signed numbers on the servers.
v3	Yes	Yes	Yes	Yes	Yes	Yes	Used in Startup Disc Menu and newer versions of the Factory System Menu. Present on launch-day Wiis.
v259	?	?	?	?	?	?	Preinstalled on Korean consoles
v65280	N/A	N/A	N/A	N/A	N/A	N/A	Stub IOS released in 3.3rev03 and 3.5. Probably v65280 because different locations were unaware of the versions of IOS4 released.