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MP 1,1-5,1 nothing happens when attempting firmware update

C

cinclodes

macrumors member
Original poster
May 12, 2022
65
12
I'm running the installer for High Sierra on a Mac Pro 5,1 that still has the original firmware. It says the firmware needs to be updated. When I click Shut Down as instructed, nothing happens. What might be the problem?
 
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