I want to boot to a USB flash to upgrade Windows 10 Home to Pro but the bios shows no boot option for USB. Laptop has 2 M.2's (128Gb and 1Tb) and 2 tb SSD. I want to reinstall windows on the 128 via USB! Help!!! Manual is worthless in this regard!!
Have you tried pressing F12 during startup to get to the boot menu rather than the BIOS?
Did you format the USB using RUFUS before installing Windows on it? I'm assuming you can't actually put Windows on the USB without doing this but I'd better ask anyway.
What are the boot options the BIOS gives you?