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Technical info
TypeSystem Menu IOS
StatusPrivate Corporate IOS

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.

Version Signing bug? STM Release Exploit? Notes
v1 Yes ? Used in the factory
v3 Yes ? Used in Startup Disc Menu
v259 N/A N/A Stub IOS found on Korean consoles.
v65280 N/A N/A Stub IOS released in 3.3rev03.