Reset Administrator password on Windows 10 tablet UEFI

There are much and more manuals in net about this stuff. But noone of them help me with this problem. I can't boot from usb flash on table.
First of all, you must enable usb boot. To enter “System Restore” you need to hold Shift key and click on Reboot option.
“Diag” → “Advanced options” → “UEFI Firmware Settings”.