I currently have win10 laptop, so i created bootable usb with MediaCreationTool, FAT32.
And when Im trying to boot it from totally clear pc, UEFI doesn't recognize flash. In case if I clear CMOS, it sees this flash as USB 3.0 or UEFI 3.0, Partition 1.
Both doesn't work, because when i go force boot from the usb stick, it looses it after reboot and asks to select proper boot device. To make UEFI see usb-stick again, I have to clear CMOS one more time.
Also, if I pass these steps, windows installer asks for missing media drivers.
Secure and Fast boot disabled, CSM enabled and legacy setting only.