Bootup

I have a Gigabyte Durable Plus motherboard and I don’t know how to boot off a CD or USB stick. Its based on UEFI but after loading a shell efi file to boot off it I ran into problems.

The original option of booting on the hard drive disappeared but Windows 11 still loaded. I don’t get how stupid UEFI is but it needs some updating so I can install multiple operating systems without bugs.

(UEFI HDD name is MEMUP PMAP Partition 1)