PSA: If You Upgrade to macOS High Sierra 10.13.1, You'll Need to Reinstall Apple's Root Security Fix. The 4,1 Mac Pro is not supported for installing macOS Sierra. So we show how I upgrade firmware to a 5,1 Mac Pro.
![Sierra Sierra](http://dosdude1.com/highsierra/tutorialimages/step2.png)
If you’re planning on running Apple’s latest and greatest macOS on your silver workhorse Mac Pro be sure to plan a little extra time for the firmware update. We’re also seeing reports of some older Macs, like the 2011 17-inch MacBook Pro, failing their firmware check after installing macOS High Sierra. Rebooting again seems to fix the problem. MacOS High Sierra was first shown off earlier this year at Apple’s Worldwide Developer Conference. It was officially released to the public earlier today and is a free upgrade for all compatible Mac models.