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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