Early Surface devices use a standard basic input/output system (BIOS) instead of the Surface Unified Extensible Firmware Interface (UEFI) found on newer devices. You can use the BIOS to manage the firmware features on your Surface.

Learn how to enable virtualization through the UEFI (or BIOS) of your PC to run the Windows Subsystem for Android or Windows Subsystem for Linux.

To change these settings, you will need to switch the PC boot mode from one enabled as “Legacy” BIOS (also known as “CSM” Mode) to UEFI/BIOS (Unified Extensible Firmware Interface). In some cases, there are options to enable both UEFI and Legacy/CSM.

If you need to enable TPM, these settings are managed via the UEFI BIOS (PC firmware) and vary based on your device. You can access these settings by choosing: Settings > Update & Security > Recovery > Restart now .

Surface Unified Extensible Firmware Interface (UEFI) replaces the standard basic input/output system (BIOS) with new features including faster startup and improved security. You can use Surface UEFI to manage the firmware features on your Surface.

Booting from a USB device doesn’t refresh or reset your Surface. Instead, it lets you start your Surface using Windows or another operating system that’s on your USB device. For info about how to create a bootable USB drive for your Surface, see Creating and using a USB recovery drive for Surface.

NOTE: You may also have to disable PCI bus IRQ steering in your computer's basic input/output system (BIOS). For information about how to do so, contact you BIOS manufacturer. The following settings determine which routing tables Windows uses when programming IRQ steering: Get IRQ table using ACPI BIOS:

For USB-connected presence sensors to work properly on these systems, you'll need to enable USB Wake Support (or a similarly named option) in BIOS settings. You can allow some apps to access your presence sensors, while still preventing access to others. Here's how:

A "clean boot" starts Windows with a minimal set of drivers and startup programs, so that you can determine whether a background program is interfering with your game or program.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC. How to open PC Health Check.

Press"F2" to enter "System Settings" (BIOS) when the DELL icon appears. Restore BIOS to default settings. Latitude C, CP and CS series systems: Restart your computer, press "F2" to enter BIOS, and press "Alt+F" to restore CMOS.