Soooo, I was attempting to upgrade to the latest Opencore vs 1.4.3 and Sanoma over the weekend with my goal to move my OS over to the M.2 on my Macfiver card. Well, no matter what I tried I could NOT get my Mac Pro to show the EFI boot option. BTW I have a 5,1.
I tried all the tricks, clearing VRAM, hard reset, etc. After a day long session of banging on this thing I finally decided to remove the Macfiver card and bingo that did the trick! I guess there's some logic in the Mac firmware that just doesn't like the Macfiver (possibly the M.2) which disables EFI.
Sadly, had to install to the SATA/SSD instead.
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