Thanks for posting your EFI to GitHub. Your Catalina works flawless with my 840 G5. I tried Big Sur 11.2.3 and it doesn't work for me. Have you had any success yet with a fresh 11.2.3?
FWIW the error I am seeing on first boot is:
Big Sur Installer error in opening <"usr\standalone\OS.dmg.root_hash">
Thanks for posting your EFI to GitHub. Your Catalina works flawless with my 840 G5. I tried Big Sur 11.2.3 and it doesn't work for me. Have you had any success yet with a fresh 11.2.3?
FWIW the error I am seeing on first boot is:
Big Sur Installer error in opening <"usr\standalone\OS.dmg.root_hash">