Mac Pro 5,1 Firmware Update issues

Mac OS High Sierra want update firmware - ah, in my MacPro 5.1(mid 2010). Tell me please are there the biggest problems ? My video card is AMD Radeon HD 7950 Mac Edition(Apple Cinema Display connected to the display port), and have a some small problem. The video card has a small bug. Mac OS Sierra 10.12.6 boots Apple logo normal, up to half the line, then screen goes black, and then the Apple logo is show again, and progress is continue fine^ and Mac OS Sierra 10.12.6 successes. If i updating firmware have i the biggest problem when updating Mac Pro 5.1(mid 2010) firmware ? If there is an error, will my Mac Pro 5.1(2010) and die Mac Pro firmware!!! Can i return to old firmware ? Thanks so much for help.Sorry my English.

However, just found out -- WARNING. If you use Boot Camp, your macOS boot drive is an SSD, you have a non-EFI video card, so use the Boot Camp app in the task bar from within Windows to boot back into OS X (since you can't use the Startup Manager on boot with a non-EFI card) -- it won't work anymore, once your SSD is (automatically) converted to APFS. The Boot Camp app in Windows will not let you select an APFS drive to boot from. I am going to try a workaround of selecting a Sierra boot volume on a different drive, and then select the Startup Drive from System Preferences there. PITA!

Hi guys I've just updated my Mac Pro 5.1 to high sierra and the update and install went through fine but after I now have " no wifi hardware installed" it looks like high sierra o longer recognises my wifi card?

Any ideas? Have tried SMC reset and nvram reset but no luck

Unfortunately this didn't work for me. After swapping cards, I get a "GPU not detected" error. No matter how many times I reinstall the drivers, nothing works.

Back to a ATI 5770 for the time being. Ouch.

Tried for days to install High Sierra on Mac Pro 2012. Then following comments, removed all pci cards, all usb's except wired keyboard, put in the oldest ATI card I had, took out 3 X16 Gb memory (can't get 4 x 16 to work) and put back 4 x 2 Gb memory, took out 3 hard Drives, leaving one with El Capitain. Installation finally worked like a dream. Try simplifying to the maximum.

Your approach sounds like it is probably on the right track. I've tried 5-6 times with either disastrous results, when I was trying to install 10.13 with an Nvidia GPU, or no results at all with the original GPU. Were there any problems when you put everything back in place in the Mac Pro?

I had the same issue and with help from Apple Support over the phone I managed to get the firmware updated as well as the update to High Sierra. I have a mid 2010 MacPro with the highest possible specs as well as an Nvidia GX780 3GB video card. Here is what I did:

1. make sure that the sound output is directed to the internal speaker and not muted, so you hear the boot chime.

2. when prompted for the firmware update, switch of the MacPro as instructed

3. switch on by pressing and holding the power button until the white led starts flashing and you hear the boot chime

This did the trick. The firmware update took about 3 minutes and I did not see a progress bar or anything, just a black screen. Also both my optical drive drawers opened and closed during the procedure. Worked like a charm.

BernardJohn, You win!That did it for me, too. I took out all the stuff I had installed since buying the Pro, put the old GPU back in, reduced the memory to bare-bones, yanked all the USB cables and PCI boards but the KB (and the monitors), plugged the Mac back in, started up, went through the lights and tones, and when the apple and progress bar came up, the firmware was installed in about 2 minutes. From the blinking light to the new system startup screen took about 1.5 hours. Thank you for your observations and suggestions.

I tried this. I saw the flashing light and heard the long harsh tone (not the boot chime). It just booted normally after and said again I need to update my firmware.

You mentioned the DVD drives opened. Could it be because I have no DVD drives? I'll update if I find anything...

I had the same issue. If you are using a non-EFI PCI video card, you will need to use an EFI card (Apple-spec ATI 5770, etc) to do the firmware update. You can put your non-EFI card back afterwards.

I had the same problem on my Mac Pro 2012 but either the 2nd or 3rd try the firmware update went through.

BUT DONT UPDATE YET. It corrupted my SSD boot drive and I'm now restoring.

Thanks to all for the qualified help !!! Installed! For fear and risk, Everything is ok on Mac Pro 5.1 mid 2010.

All day i'm testing my installed programs.

Still working the next day?

All good here on Day 2 (except for the Boot Camp/APFS issue noted above)!