I tried to fix my bluetooth issue by messing around in the BIOS. Big mistake! I toggled the Port 60/64 setting, which has something to do with PS/2. And after that I was not able to boot again. I tried everything. Including CMOS reset.
So, I decided to do a fresh install. I have 3 backups. What could possibly go wrong!
I created a BigSur boot USB flash drive. Added your OpenCore config. Added -v in the bootflags. Added my serial. Boots fine. Erased and installed SSD disk. And after booting the installed partition, this happens...
I'm pretty sure the BIOS settings are accordingly to your first post. I did it twice, just to be sure.
BTW, I'm on BIOS F9l.
Any ideas?