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WinPE: Boot in UEFI or legacy BIOS mode

Applies To: Windows 8, Windows 8.1, Windows Server 2012, Windows Server 2012 R2
When you boot Windows PE on a UEFI PC, you may need to check whether the PC is booted in UEFI mode or legacy BIOS-compatibility mode.
For example, running Windows Setup through Windows PE requires you to be in the correct firmware mode.
For many operations, such as applying Windows images using Diskpart and DISM, the firmware mode might not make a difference.

Boot to UEFI mode

  1. When booting the PC, you may need to manually select the UEFI boot files: \EFI\BOOT\BOOTX64.EFI.
    1. Boot your PC and press the key to get into the firmware menus (examples: Esc, F2, F9, F12).
    2. Look for a firmware option to choose the boot file (examples: Boot to file, Boot to EFI file).
    3. Select the file from the USB drive: \EFI\BOOT\BOOTX64.EFI.

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