UEFI (Unified Extensible Firmware Interface) is a specification for a software program that connects a computers firmware to its operating system. It replaces the standard basic input/output system (BIOS) with new features including faster startup and improved security. UEFI is installed at the time of manufacturing and is the first program that runs when booting a computer. It checks to see which hardware components are attached, wakes up the components, and hands them over to the OS.

To access the UEFI firmware settings, you can use one of the following methods:

• Use F2/F10 or F12 keys at boot time to access UEFI settings. This is the classic method of accessing UEFI or the BIOS system. Turn on your system and press the F2/F10/F12 or Del/Esc key when the Windows logo shows. Let the computer enter BIOS settings, and then go to the Boot tab. There youll get a clear view of the UEFI firmware settings on your PC.
• Access UEFI from Settings. Open Settings, click on Update & Security, click on Recovery, under the "Advanced startup" section, click the Restart now button, click on Troubleshoot, click on Advanced options, and click the UEFI Firmware settings option. Click the Restart button, and your system will restart and boot into the UEFI firmware settings screen.
• Use Surface UEFI. Shut down your Surface and wait about 10 seconds to make sure its off. Press and hold the volume-up button on your Surface, and, at the same time, press and release the power button. The Microsoft or Surface logo appears on your screen. Continue to hold the volume-up button. Release the button once the UEFI screen appears. Select Exit > Restart now to save your changes and restart your Surface.

Its important to note that the UEFI firmware settings are only available on computers with motherboards that support UEFI boot. Changing the wrong firmware settings can prevent your computer from starting correctly, so its important to only access the motherboard firmware when you have a good reason and know what youre doing.