Boot menu:F10
Bios setup:F2
Bios flash:
Network boot:
OS recovery :

Can't boot from USB with ISO image, only from USB with master record (like Grub).
Can't boot form left USB ports.
For boot from USB, select in BIOS: Exit → Boot Override.
To disable UEFI:
Boot → Secure boot → Disable, Boot → OS mode selection → CSM OS (not «UEFI OS» or «UEFI and Legacy OS»).