You have a long superseded BootROM version, you will need to first do a clean install of 10.13.6 High Sierra full installer to get to MP51.0089.B00. After that you can go to Mojave, read the first post that I linked.
Btw, Monterey is a headache each update, Apple will probably send at least one more big update of Monterey yet, even with fully supported Macs, like MacPro6,1.
Upgrade to Big Sur 11.6.8, it's rock solid with a fully upgraded MacPro5,1.
Yes, but you are aware that the factory installed AirPort Extreme card is not supported since Catalina, no? Did you upgraded it to AirPort Extreme BCM94360CD?
Thanks Alex, you are awesome.
Short question on the AirPort Extreme. I have upgraded that card a couple years ago and have no problem so far, running Catalina. My version however has a different number than the one you have mentioned above. I have this:
en2:
Card Type: AirPort Extreme (0x14E4, 0x111)
Firmware Version: Broadcom BCM43xx 1.0 (7.77.61.2 AirPortDriverBrcmNIC-1305.8)
MAC Address: 88:63:df:ac:ed:e9
Locale: ETSI
Country Code: X3
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161
Wake On Wireless: Supported
AirDrop: Supported
AirDrop Channel: 0
Auto Unlock: Supported
Status: Off
Question #1: So far I did use DosDude1 Patcher to have full Catalina support on my 5.1
However, the time comes closer now that I have to install OpenCore in order to upgrade to Big Sur as you mentioned above. Will that Wifi card model above work as well, or do I have to upgrade to BCM94360 for Big Sur?
Question #2: My reason for going to Big Sur is a new AMD 6800 dual slot card with the Apple Firmware patch to make it work in a MP 5.1. Unfortunately it will not work with Catalina. Now, I assume I will need to do the OpenCore Patcher first (1) than install the BigSur with the old AMD 580 pulse (2) and then exchange the GPU model to the 6800 dual slot flashed EFI card (3) to run it under Big Sur. After the GPU swap I will install a Titan Ridge card (4) for TB3 support. Is there anything I need to do on the OpenCore Patcher in step (1), regarding that modified Titan Ridge card or is it plug-&-play?