I have an Asrock z270 with an i5-7600, Radeon RX560. Since it is quite different from your config, I followed the OpenCore vanilla guide. I booted with the USB, and some text flashed by, then the numeric OpenCore menu came up: *1. EFI, 2. TIME Mc, 3. macOS, 4. Recovery 10.15.7, 5. OpenShell.efi...