PowerBook Firmware Update v4.2.9 for 550/667 MHz PowerBooks

1999–2004December 26, 2001Macs Only!Mac OS
is available via the Software Update feature or as a download from Apple's server. "Firmware Update 4.2.9 includes improvements to Firewire target disk mode when running Mac OS X, and improves starting up on systems with 1 gigabyte (GB) RAM and enables Netbooting over gigabit Ethernet." It must be run from Mac OS 9.x.

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