How to Enable Uefi on Pc
Confirm UEFI support, check the current boot mode, convert BIOS/MBR to GPT if needed, then switch the firmware setting without breaking Windows.
Check the firmware setup first. If the PC already boots with UEFI, change only the boot mode or firmware entry method. If Windows is installed in Legacy BIOS/MBR, convert the disk to GPT before you switch. In the wrong order, the PC may stop booting and BitLocker can ask for recovery. This guide shows how to confirm UEFI support, verify the current boot mode, change the smallest needed setting, and keep the installed Windows boot path intact. (Microsoft Learn)
What you'll need
- A Windows sign-in screen or administrator access to Windows.
- The PC maker’s startup key, such as F2, F10, F12, Delete, or Esc.
- The BitLocker recovery key if device encryption is turned on.
- A note of the system disk’s partition style: GPT or MBR.
- Windows installation media only if you need to repair or convert after a failed boot.
Do you need to enable UEFI or just open UEFI settings?
Most users do not need to turn on UEFI at all. If the PC already boots in UEFI mode, you usually only need the firmware menu to change Secure Boot, boot order, or a one-time boot choice. If Windows is installed for Legacy BIOS with an MBR disk, switching only the firmware mode will not boot the existing install. Windows can open firmware settings through the Advanced startup options. Microsoft says UEFI is the safer choice than legacy BIOS.
| Symptom | Current disk style (GPT/MBR) | Likely firmware mode | Exact action | Risk |
|---|---|---|---|---|
| You only need Secure Boot or boot order changes | GPT | UEFI | Open UEFI Firmware Settings and change the setting you need | Low; BitLocker may still ask for a recovery key after firmware changes |
| Windows starts normally and you want to check firmware options | Unknown | Unknown | Use Troubleshoot > Advanced options > UEFI Firmware Settings, or the startup key path | Low; no boot-mode change yet |
| Windows was installed in Legacy BIOS mode | MBR | Legacy BIOS | Convert the disk to GPT first, then switch firmware mode | High if you flip to UEFI first; boot failure and BitLocker recovery are common |
| You need to boot older network tools or BIOS-only media | MBR or GPT | Legacy BIOS may be required | Use the BIOS boot entry, or temporarily disable Secure Boot if the media needs it | Medium; Secure Boot changes can trigger BitLocker recovery |
What key opens UEFI setup on my PC?
The startup key is the fastest route when you need firmware setup before Windows loads. Common keys are Esc, Delete, F1, F2, F10, F11, or F12. On tablets, use Volume up or Volume down. If the prompt disappears too fast, check the manufacturer’s support page for the exact key. (Microsoft Learn)
- Shut the PC down completely.
- Power it on and press the manufacturer’s key repeatedly.
- Choose BIOS Setup, System Setup, or UEFI Setup if the menu appears.
- If you only need one boot, use the one-time boot menu instead of changing firmware mode.
Dell systems often use F2 for firmware setup and F12 for the boot menu. On Dell PCs, F12 may open BIOS Setup or System Setup directly, which helps when you need setup without waiting for Windows.
Picture a laptop that shows “Press F2 for Setup” for half a second. If Fast Startup is on, the prompt can disappear before you react. A full shutdown, then a cold boot, usually gives enough time to catch it.
How do you switch from Legacy BIOS to UEFI?
Switch only after you confirm the installed Windows disk is GPT or you have converted it with MBR2GPT. A blind switch from Legacy BIOS to UEFI is the common failure case: the firmware changes, but the installed Windows entry still expects MBR/Legacy boot. Suspend BitLocker first, because firmware changes can trigger a 48-digit recovery prompt.
- In Windows, open Control Panel > BitLocker Drive Encryption and suspend protection before changing boot settings.
- Check the system disk with Disk Management or diskpart and confirm whether it is GPT or MBR.
- If the disk is MBR and Windows is already installed, run MBR2GPT from a supported Windows environment before changing firmware mode.
- Restart into firmware setup and set the boot mode to UEFI.
- Save changes, exit, and confirm that Windows boots normally.
Say your desktop still boots from an MBR disk and you switch the firmware to UEFI first. The system may stop at a no-boot device screen because the installed boot files do not match the new mode. Converting first avoids that dead end.
How to enable uefi secure boot on pc
Secure Boot matters only when the boot media or policy needs UEFI security features. It is not a single switch for every device. If you must boot BIOS-only media, Secure Boot can block it, and changing that setting can trigger BitLocker recovery on consumer PCs.
- Open firmware setup with the startup key or from Windows.
- Go to Security > Secure Boot.
- Enable Secure Boot only if the installed OS and boot media support UEFI.
- Save changes, exit, and watch for a BitLocker recovery prompt on the next boot.
If that prompt appears, enter the 48-digit recovery key before making more changes. Do not keep toggling Secure Boot back and forth; that usually adds confusion without fixing the boot path.
Why is UEFI firmware settings missing in windows?
The option is missing when the machine is not booted in UEFI mode, when firmware support is limited, or when the vendor hides the menu behind its own recovery path. Some older PCs can still support UEFI, but only if you browse to a boot file from the firmware menus. Some devices support only one mode, and some require BIOS mode for a legacy network boot.
- From the sign-in screen or Start menu, select Power > hold Shift while selecting Restart.
- Go to Troubleshoot > Advanced options > UEFI Firmware settings.
- If the menu is absent, use the startup key path at power-on.
- On older systems, look for Boot from file if you need a UEFI boot file path.
Common vendor keys and Windows paths
| Vendor or path | What to try | Notes |
|---|---|---|
| Windows Advanced startup | Power > Shift + Restart | Then Troubleshoot > Advanced options > UEFI Firmware settings |
| Common startup keys | F2, F10, F12, Delete, Esc, F1, F11 | Timing matters; press repeatedly at power-on |
| Dell boot menu | F12 | Can show BIOS Setup or System Setup |
| Tablets | Volume up or Volume down | Used instead of a keyboard key on some models |
Common mistakes
Changing Secure Boot before checking the boot media. BIOS-only installers and some network tools may stop booting. If the media needs Legacy BIOS, use the BIOS boot entry or disable Secure Boot only for that boot.
Switching to UEFI on an MBR Windows install. That is the most common boot failure. Convert the system disk with MBR2GPT first, then change the firmware mode.
Missing the startup key because the system is too fast. Use a cold boot, not a restart from Fast Startup, and press the key repeatedly from power-on.
Ignoring BitLocker. Suspend protection before changing boot-related settings or be ready for a 48-digit recovery key prompt.
Frequently asked questions
Will BitLocker ask for a recovery key after changing UEFI settings?
It can. Any firmware change that affects boot order, Secure Boot, or boot mode may trigger the 48-digit recovery prompt. Suspend BitLocker before making the change, then resume protection after Windows starts normally.
What should I do if my PC only supports BIOS mode?
Leave it in BIOS mode. If the machine only boots BIOS, UEFI is not an option on that hardware. For BIOS-only media or legacy network boot, use the BIOS boot entry or disable Secure Boot only when the boot task requires it.