It's an old bug that Apple corrected with late-2013 Mac Pro and 'forgot' to correct with MP5,1.Ī lot of people report that can't upgrade the BootROM from High Sierra installed with HFS+, so use a new/empty drive to install High Sierra from an APFS partition. You can't update to newer firmwares, with a 4K or DisplayPort v1.2/1.4 screen connected to your GPU. Here's the comment about the 4k Display issue: I was (I think) at 00Īfter making those two changes, it finally worked. It's probably a matter of the BootROM release at which you start the process. I provided this advice because after 15 failed attempts at updating the firmware, I found a couple of web links with comments about out 'leftover bugs' in the firmware update process that caused my repeated failures. Had absolutely no problem getting the firmware upgrade to run and take.I sure hope the OP has the same experience that you did! Didn't end up moving to an SSD and APFS until last summer when we were already pretty much done with Mojave and Catalina was on its way in. First reboot with the Radeon 570 and Mojave the TV went right to 4K and nobody could read a damn thing under those tiny desktop icons on the 55' TV hah. Its the first thing the Mojave installer makes you do no matter what. Had absolutely no problem getting the firmware upgrade to run and take. There is very little boot time value in going NVMe for the boot drive.My Mac Pro was connected to our 4K Fire TV when I did the upgrade, and I was still using HDDs at the time, 100% HFS+. Support him with a donation if you decide to go Catalina. The DosDude1 Catalina Patcher for installation is brilliant and works beautifully. If updating from High Sierra, make sure it's APFS, and not HFS+, otherwise the BootROM update won't work. The BootROM update won't work if there's a 4k-capable display attached. Make sure you upgrade the BootROM to 144.0.0.0.0 I've also helped a friend with a 6-core 5,1 Mojave with a Radeon RX 580.

I own a 12-core 5,1 running Catalina with an AMD 5700XT, and a 6-core with Mojave running a home-flashed HIS 7950 (sort of a Radeon HD 7950).

Metal compatible graphics cards