How can Hi10X boot from USB CD/DVD drive?

Hi. all.

I’m searching for the way to boot from CD/DVD drive connected via USB.
I tried 2 cases.

  1. Boot type is set to UEFI in BIOS and DVD that includes Ultimate Boot CD (UBCD.iso) is loaded on the CD/DVD drive
  2. Boot type is set to LEGACY in BIOS and DVD that includes Ultimate Boot CD (UBCD.iso) is loaded on the CD/DVD drive

USB CD/DVD Boot priority in BIOS is set to be higher than HDD, USB memory & NVME. Of course, case 1 failed. However I didn’t expect that case 2 failed. Both cases ended in starting Windows10.

What I want to do is just building the CD/DVD-based environment to inspect my Hi10X. Are there any methods for this ?

Thank you for reading.

EDIT:
What’s this BIOS setting?