I actually use optical out from rear on Windows, not analog audio out jack.
I also have an USB dedicated audio interface - it works.
But from some reasons I want to use optical digital output from motherboard.
After many tries, and helped by smart folks from here, finally is working!
CPU: AMD Threadripper 3960X
Mainboard: Asus ROG Strix TRX40-E Gaming
RAM: Corsair 128 GB RAM (32GB x 4) - 3600 MHz
1 TB SSD PCIe Gen. 4 - Corsair MP600 Pro: 7000/5500 MB/s R/W - Mac OS X Big Sur 15.5
I already tryed with OC 0.6.9, with Big Sur 11.4 and then 11.5 beta.
Many of you tried to help me, but still the same problem: it restarts automatically at installation's screen 12 min remaining time, and the OC boot menu is the same like first install.
It just boot back to the first welcome page at install...
Regarding my hardware configuration as you may see in my signature, can I use your EFI from first post without any changes ? Or should I make some modifications?