I'm trying to enable pxe boot on newly bought Vostro 7500 as I need to re-install the OS via MDT and want to set the laptop boot mode to PXE. But, when I go into BIOS Setup (F12) it shows me "Boot Configuration" option on the left pane, but when I go into the Boot Configuration there is no option to change boot order instead it just lists "Windows Boot Manager" and "UEFI Hard Drive" options and there is no way I can go into those and change the boot order within those. Can anyone please tell me how to do this on BIOS setup. thanks.