Win 10 Home 64 bit Version 1607
If I understand, this computer should have UEFI, rather than old-hat BIOS.
The instructions I have found;
settings/update & security/recovery to "Advanced Setup".
Restart Now/troubleshoot/advanced options/startup settings/restart ...
does not get me into UEFI. The option that's supposed to be there is simply completely missing. I guess Microsoft has changed their minds about putting it there. Or, it's an upgrade-from-Win 7 hiccup.
I can access what must be part of UEFI by restarting and pressing ESC. But all that is there is Please Select Boot Device, with 3 options, non being USB.
And that is it; there is nothing else available there. I've tried everything I can think of to page-over or anything. I was exploring changing boot order, so I can download new Windows 10 iso from flash drive.