You can download Apple PowerBook Firmware 4.2 for Mac from our software library for free. The file size of the latest installation package available is 1.2 MB. This free Mac application was originally developed by Apple. Our built-in antivirus scanned this Mac download and rated it as 100% safe.
From the developer:
The PowerBook Firmware Update 4.2.9 will only run on 550MHz or 667MHz PowerBook G4 computers running Mac OS 9.1 or later from a local drive. If you are using Mac OS X you must boot from a local Mac OS 9.1 writeable partition (not a CD, or network disk) prior to following the update instructions.
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