I Have HP Pavilion 17-f197nf Catalina and Mojave work perfectly but when i try Update to Big Sur from Catalina, just freeze on 1st reboot.
PS: Catalina and Mojave use the same EFI and work with all fonctional hardware (even battery). Do i need to build EFI from OpenCore ?
Boot with arguments debug=0x100 to avoid immediate reboot on KP and shot your screen and post for Help.
Also let us know how you Downloaded Install.app and create Installer USB Stick