g4 Powermac AGP firmware 4.2.8 (4.28fl) updater needed

HI, I am looking for a download for the above firmware updater. I got a G4 AGP with the old firmware, and I can't find it anywhere online, the links are all old. Could someone direct me to a link/download that works? Thanks!!

Posted on Mar 25, 2019 2:11 AM

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Posted on Mar 25, 2019 7:50 AM

I found this Apple page:

Power Mac G4 Firmware Update 4.2.8: Information and Download

and successfully downloaded it less than a minute ago.


NOTE: Does this G4 have an aftermarket processor upgrade? In searching for the about link I saw a lot of discussions where it was needed by some third-party processor upgrades, and those often were a special version that had to be sourced from the firm that made the upgrade, like Sonnet or NewerTech.

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Question marked as Top-ranking reply

Mar 25, 2019 7:50 AM in response to mdmcxyz

I found this Apple page:

Power Mac G4 Firmware Update 4.2.8: Information and Download

and successfully downloaded it less than a minute ago.


NOTE: Does this G4 have an aftermarket processor upgrade? In searching for the about link I saw a lot of discussions where it was needed by some third-party processor upgrades, and those often were a special version that had to be sourced from the firm that made the upgrade, like Sonnet or NewerTech.

Mar 25, 2019 1:19 PM in response to Allan Jones

Thanks so much, Allan. You are exactly right. I have been using a G4 AGP with a Sonnet processor and used to have all the necessary updaters, and all my music software and hardware is all G4 era. It's getting on, and I got a chance to pick up another G4 for change, and it turns out it's in pretty good shape. I have another Sonnet processor I want to put in, and couldn't find my firmware updater, and all the google pages had outdated links. I don't use the Apple support pages much, and it's changed so much I couldn't figure out how to find it. I was going to use it for parts, but it is pretty clean so I might completely swap out the one I am using for this one, after getting a new hd and RAM for it. Thanks again, one headache cured! I used to use OS 10.4/OS 9.2.2 and go between both, but I started having a lot of trouble with the screen going nuts one me when switching to OS 9.2.2 from OS 10x, so I completely dumped the idea and just use the G4 2. OS9.2.2 for my music, and now have a Mini for other communications. A lot less stress. Thanks again for finding that page. I bookmarked it and downloaded. Michael

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g4 Powermac AGP firmware 4.2.8 (4.28fl) updater needed

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