F1 to enter BIOS
Select security tab
Secure Boot - set to disabled
Click on "Reset to Setup mode"
Go to Startup and select UEFI/Legacy and set to Both
Press F10 to save and exit
As it reboots press F12 to select Boot devices
You should now see your USB drive - select it.
It should now boot from your USB drive if you have mabe it bootable with Hitmanpro kickstart.