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High Sierra Firmware Update
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High Sierra Firmware Update


  • Subject: High Sierra Firmware Update
  • From: Richard Charles <email@hidden>
  • Date: Tue, 26 Sep 2017 08:25:46 -0600

I have a 2009 Mac Pro with the firmware upgraded from MacPro4,1 B08 to
MacPro5,1 B03. It has been running macOS Sierra flawlessly for 9 months. Now
when installing macOS High Sierra I get the following message.

     "To install macOS High Sierra, a firmware update is required.”

So apparently High Sierra upgrades the firmware on Mac Pro 5,1 models.

     https://www.macobserver.com/news/mac-pro-macos-high-sierra-firmware-update/

Question: Has anyone successfully upgraded the firmware an older Mac Pro when
installing High Sierra?

--Richard Charles

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