Apple releases Power Mac G5 Uniprocessor Firmware Update 5.1.5f1

Apple today released Power Mac G5 Uniprocessor Firmware Update 5.1.5f1 which improves general system reliability and restores sleep functionality.

To upgrade the firmware on your Power Mac G5, read through the instructions below.

The Power Mac G5 Firmware Updater Version 5.1.5f1 is installed in Applications/Utilities.

1. Save changes to open files and then quit all other open applications, if necessary.
2. Open the firmware updater.
3. Click Shut Down in the Firmware Update window to start the update. Wait for your computer to shut down, quit any applications and save changes if necessary.
4. Press and hold in the Power button on the Power Mac G5 until you hear a long tone or see the Power button light flashing.

The firmware updater starts automatically. A status bar shows the progress of the update. You may see more than one status bar.

After the update is complete, your system restarts automatically. When a message says your computer


  1. Okay, idiotic question time, but is this something that is for ALL G5’s, or just the configuations that have the single processor? Judging by the “uniprocessor” in the name of the update, it appears that the DP machines don’t need this, but the description on Apple’s site doesn’t specifically list the hardware that needs this update…

  2. My G5 is screwing up big time now. I installed the firmware and the security patch yesterday and now the box has required 2 hard resets, 2 fails to reboot, 1 failed logon, X crashing over to a Darwin command prompt, and all of the applications I run crashing.
    I don’t know if these updates are the problem, but the machine is hurting now.

  3. I made the mistake of updating the 5.1.5f1 firmware on my machine before reading the Apple discussion boards and now my machine is routinely crashing and freezing up. This update seems to adversely affect both 3rd party and non-3rd party ram. I can now only run my machine with half my memory otherwise it will crash and freeze. I would highly recommend avoiding this update until Apple releases a fix.

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