![]() ![]() Download High Sierra installer from the Mac App Store, The High Sierra installer will then ask you to perform a firmware update, shutdown your Mac Pro and do it. After 10.12.6 is installed, download the High Sierra 10.13.6 full Mac App Store installer and open it (yes, you will upgrade Sierra to High Sierra don't do a clean install). ![]() Power on your Mac Pro and do a clean install of 10.12.6.Remove all disks except the one that you will do a clean install of 10.12.6.Clear your Mac Pro SMC and NVRAM - clear NVRAM 3 times sequentially.Shutdown your Mac Pro and remove all PCIe cards except your Mac EFI GPU.Use createinstallmedia to create a Sierra USB key installer.Download 10.12.6, and later 10.13.6, current installer(s) from the Mac App Store.
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