Strange Bios seqence

Built an Aomei backupper PE boot disc for recovery purposes when and if needed.
M/B Gigabyte Aorus Elite B450 with bios as current version.
My limited understanding is that,boot sequence due to my win10 O/S being on a CD disc that no1 would be CD Drive and no2 would be my 256gig SSD and 3rd would be my I tera ssd drive and 4th further option to select USB drive.

Im at a loss as to the as shown picture ,no2 boot ( PXE IP4 realtech PCIE family controller ) and no option to select USB drive .
Fastboot is not enabled and i dont want to alter anything before understanding this unfamiliar bios.
Many thanks

Enter to the BIOS, Load Optimized Defaults (press enter) then Save & Exit Setup (press enter)

If the system sees a bootable USB drive it ought to appear in that boot sequence - but if it doesn't, try hitting F12 during reboot to bring up the boot-option menu - it should definitely appear there. The boot priority order can be altered to suit your needs, so no initial order can be easily predicted - just change it to what you want. (comments based on my having a Gigabyte MB, so I assume F12 will work for you also).

Grom0X said:

Enter to the BIOS, Load Optimized Defaults (press enter) then Save & Exit Setup (press enter)

Thanks Grom0x I saved initial settings just in case and loaded optimized defaults ,that in tern got rid of the family controller and the PXE B03-D00 from the boot sequence
Now it reads what im used too, dont know where those entries came from ,as this was my first time looking into the bios since the computer was initially custom built . Ived had no need to ,up until this point .
Cheers.

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mngerhold said:

If the system sees a bootable USB drive it ought to appear in that boot sequence - but if it doesn't, try hitting F12 during reboot to bring up the boot-option menu - it should definitely appear there. The boot priority order can be altered to suit your needs, so no initial order can be easily predicted - just change it to what you want. (comments based on my having a Gigabyte MB, so I assume F12 will work for you also).

Thanks mngerhold. Familiar with F12 but it showed the same listings ???? Not now though ,just proceeded with caution first.