Ola Maldon,
I was using your EFI files, and the system boots in to installer for Catalina, no lucky for Big Sur. I installed Catalina but, built in ethernet does not work.
Setup:
Asus ProArt 10G
i9 10900K unlocked con CFG unlock needed, as far I know
XFX RX 580 8GB
SAMSUNG 840 EVO 120GB SSD
The system installed properly, and in the final installation stage if I check “connect to internet” the installer crashes. I finally check “No connect to internet” and the installer finished properly, but the ethernet as expected dors not work. I used the CLOVER EFI, could be different with OC?
Regards
Fran