

Rebooting again seems to fix the problem. 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. 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. Those are the big silver box style manufactured between June 2012 and October 2013 when the black glossy cylinder style Mac Pro was introduced. It looks like the Mac Pro firmware update is showing up just for the 5,1 models. macOS High Sierra includes a firmware update for the silver Mac Pro The firmware update installs as part of the High Sierra upgrade process so you don’t have to go looking for it before making the jump to the new OS. We have a full list of which Macs run which versions of Mac OS X and macOS here.If you’re still rocking a cheese grater-style Mac Pro, macOS High Sierra may include a firmware update for you.

Here’s an overview of every version of macOS and Mac OS X Apple has released. List of macOS version names and latest versions
