Secure boot is set to disabled. What is set to Auto is Preferred Operating Mode. I’ve enabled CSM Support now. I get “Other OS”, “Windows 10”, and “Windows 10 WHQL” in the Windows 10 Features section. I tried Windows 10 WHQL and Other OS together with CSM Support set to enabled, with all drives in the boot priority and also with only Drive 1 as boot option but I still get stuck at the motherboard screen when booting.
I’ve downloaded the latest BIOS version for the Z590 UD AC motherboard from Gigabyte now and installed it through Q Flash. I went from version F2 to F4, a version that’s about 5 months newer. I still get stuck at the motherboard screen when booting.