To switch back to UEFI, restart your computer and access the BIOS setup by pressing the appropriate key (often F2, F10, or Delete) during boot. Locate the Boot Mode setting and switch from Legacy ...

If you had been operating in the Legacy mode, you must press F2 to enter the BIOS and change the boot order back to legacy, then reboot the system. You will also need to press F1 to boot (due to ...