I am also struggling. I posted my ISO via google drive below if you don't mind having a look.Upload your EFI and I'll double check it.
I am running a 5950X with RX 6800xt on an Alienware R10. One thing I am struggling with is knowing whether I have a B550 of X570 MB. I read multiple forums that suggested CPUiNFO and HwInfo is displaying the incorrect details. They both state I have X570, but again, I read that this is a mistake and I actually have B550.
Anyhoo, again... I posted an iso image of my USB I am trying to use below. Any help is greatly appreciated.
Google Drive: Sign-in
Access Google Drive with a Google account (for personal use) or Google Workspace account (for business use).
drive.google.com
Also, I am including pictures of the different errors I revived with CPU PLUG and without, with Mojave, BigSur, Catalina, etc. I have bee trying different combinations to try and strong arm this into working. :-/
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