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The Power Mac G4 Firmware Update 4.2.8 will run only on Power Mac G4 and Macintosh Server G4 models with AGP graphics running Mac OS 9.1 or later from a local hard disk. If you are using Mac OS X on your Power Mac G4 or Macintosh Server G4, you must start up from a local Mac OS 9.1 or later writeable partition (not a CD or network disk) before following the update instructions.
Firmware Update 4.1.9 is available for Power Mac G4 Cube models and iMac computers with slot-loading CD or DVD drives.
Firmware Update 4.2.8 includes improvements to starting up Mac OS X from the local hard disk, FireWire target disk mode, network startup, gigabit networking (on systems with gigabit hardware), and system stability. This update also adds support for additional security options that allow the Open Firmware to be password-protected.
G4-FW-Update-4-2-8.smi.sit (1 MiB / 1.05 MB)
G4 Firmware Update 4.2.8 / compressed w/ Stuffit
Power Mac G4 and Macintosh Server G4 models with AGP graphics