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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.

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.