Hello Maldom, well I installed big sur with the last efi that you sent me, I have two clean installations from the Raw of ka orarilla web with an HHD disk and once I checked that everything worked, I made an installation from the AppStore on my Catalina system . I send you photos. When I enter with the unit where it is, the system does not go beyond the block, it does not load, but if I enter with the installer if it loads the system and starts well, that happens to me with the two big sur systems, the one that is installed from orarilla and the one that install from the appstore.
https://prnt.sc/vp9yhf