I have a mid-2010 MacPro. I'm trying to install High Sierra, but I keep getting this message: "To install macOS High Sierra, a firmware update is required." I can't find any firmware updates. I've tried holding the start button down several times, but I still get the message.
Mac Pro, macOS Sierra (10.12.6), MacPro 5,1, with 2.8GHz quad-core
Hi - I have the same model Mac Pro (mid-2010, 2.8 GHz Quad) and was having similar issues - but you might want to try the following:
In the instructions in the screen shot you posted, it tells you to hold down the power button until the power indicator light flashes OR you hear a long tone.
The first time I attempted the update I held down the button until the power light flashed and then let go. The long tone happened after I let go of the button and I got a normal looking startup screen (grey Apple logo with black status bar).
Upon restart, I was just taken to the same screen advising me that I needed to update the firmware.
The second time I attempted the update, I kept my finger on the power button past the flashing power light and until the long tone sounded. Only then did I let go of the button.
This time a different (old school/low res) startup screen showed up where both the Apple logo and the status bar were grey. The SuperDrive tray opened, the status bar went to completion and the SuperDrive tray closed itself again.
When the machine restarted it took me to the screen where I could proceed to install High Sierra, which happened successfully.
I'm not sure of the technical reason why this worked, but it did. Hope it helps you too.
It didn't work, unfortunately.
I currently have Sierra. What should I do?
Do I have to erase the disc?
I can't find either El Capitan or Sierra in the App store.
Thanks much. This "little" trick worked also for my macbook pro 11,1
Mine is MP51.007F.B03 - how do I get it to update?
Stephan and Alberto: both your suggestions were good, so I tried out both at the same time (my startup disc was my old backup disc.) No luck, so I'm still stuck with Sierra 😟
The Firmware Update after endless trying w. diffent (EFI) Videocards extern HD's My The Firmware Update is really coming from INFINTY LOOP maybe for ever?
Mac Pro 5,1
Sorry, I don't understand.
I am constanly booting (Press Power Button 3 Blink & Sound newstart ) but the FW is never installed = an INFINiTY LOOPING
Is this what you mean?
SMC Version (system): 1.39f11
SMC Version (processor tray): 1
SMC Version (system): 1.39f11
SMC Version (processor tray):
Is this after the FW Update?
Found it
That's the problem - I can't update my firmware. I get this window, and the shut down button at the bottom is grayed out.
I hav done the same put the Original 120 card in - my AMD 7950 is w Apple Firmware my RX 580 works w10.12 but no succes with all 3 cards...
"To install macOS High Sierra, a firmware update is required."
