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Question: Where can I download the firmware update for High Sierra?

A few weeks ago I made the mistake of trying to upgrade to High Sierra. Why does Apple pull this crap without warning us? The firmware update that enables OS 10.13.(whatever) to work within a system for which it wasn't designed, to wit: any Mac that isn't equipped with a solid-state boot drive, Is a kludge. I tried to install it in an otherwise fully-functional Mac Pro 2012, and the "firmware update" alone brought down the system! I couldn't get far enough to even think about upgrading the OS, and meanwhile, my Mac Pro, upon which I depend for a living, required the services of the equivalent of a neurologist. It was out of service for close to a week. I notice that there have been at least two revisions to the High Sierra installer since that time a few weeks ago. Gee, I wonder why? Were they too proud to include a "Read Me" file with the installer? In my estimation a Read Me would have been ineffective. A skull and crossbones would have been closer to the truth. I won't be risking my livelihood to install OS 10.13 on my Mac any time soon, but If I can download the firmware update I can try it on a dummy drive.

Mac Pro, macOS Sierra (10.12)

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The firmware update is applied to firmware on the processor board. If you successfully updated to High Sierra, you have already applied the firmware update, and it is not available separately. It would have given you:


Boot ROM Version: MP51.0084.B00


so if you have that version, you have the update, and it will not be offered again.

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Nov 11, 2017 7:27 AM in response to Birck Cox In response to Birck Cox

The firmware update is applied to firmware on the processor board. If you successfully updated to High Sierra, you have already applied the firmware update, and it is not available separately. It would have given you:


Boot ROM Version: MP51.0084.B00


so if you have that version, you have the update, and it will not be offered again.

Nov 11, 2017 7:27 AM

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Nov 11, 2017 7:28 AM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

Thank you for the information. That version isn't currently installed on the hardware, so I'll have to try updating the firmware from the dummy drive, which has an OS 10.12.6 system on it, and nothing else. If it works, fine. If it doesn't, I'll reformat the dummy drive and go back to 10.12.6.

Nov 11, 2017 7:28 AM

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Nov 11, 2017 8:17 AM in response to Birck Cox In response to Birck Cox

I just tried installing the firmware update on the dummy drive: Reboot onto dummy drive, a conventional HDD, with a functional OS 10.12.6 on it and a High Sierra Installer. Result: same problem I had before. The install hangs at the progress bar, with no Apple logo onscreen, and the progress bar goes nowhere. Still a kludge.

Nov 11, 2017 8:17 AM

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Nov 11, 2017 9:17 AM in response to Birck Cox In response to Birck Cox

My experience with doing the firmware update was that it took forever -- as long as five minutes -- to do the firmware update itself.


Also, you must have a graphics card that has genuine Mac firmware installed in your Mac. A PC card will NOT suffice.

Nov 11, 2017 9:17 AM

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Nov 11, 2017 10:25 AM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

That's an important point. My GPU is an EVGA Nvidia board that has been "flashed" for Macs. Is that what you are referring to? The firmware update screen comes up-I'm not faced with a black screen-but without an Apple logo, and with no apparent progress on the progress bar.

Nov 11, 2017 10:25 AM

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Question: Where can I download the firmware update for High Sierra?