Success: upgrade from Catalina/opencore 0.6.3 to Big Sur on ASUS ROG Strix H370-I Gaming

I had the very latest Catalina on OpenCore 0.6.0. I tried to update the EFI folder to 0.6.3 and failed.
I then created a opencore 0.6.3 EFI folder from scratch, and that worked rather quickly.
Then I used the standard MacOS upgrade feature, with 5-6 reboots.
Only problem is with a virus checker...