NUC BIOS – UEFI Shell Update

The UEFI Flash BIOS update utility allows you to update the BIOS from the EFI Shell.

Select UEFI Built in EFI Shell

  1. Download the UEFI Flash BIOS Update file (* Example:
    iFlash BIOS Update file
  2. Double-click the * to extract its files.
    Double click UEFI zip file
  3. Copy UefiFlash.efi and the .bio file to the bootable USB device.
  4. Connect the USB drive to a port on the Intel NUC.
  5. Configure the BIOS of the target computer to boot to the EFI Shell:
    1. Press F2 during start to enter BIOS setup.
    2. Go to Advanced > Boot > Secure Boot.
    3. Disable Secure Boot, if enabled.
    4. Go to Advanced > Boot > Boot Configuration.
    5. In the Boot Devices pane, enable Internal UEFI Shell.
    6. Press F10 to save changes and exit BIOS Setup.
  6. Press F10 during start to open the Boot Menu.
  7. Select UEFI: Built-in EFI Shell.
  8. Change the current directory to the USB flash drive by entering the command fsX: where X is the drive number of the USB flash drive from the device mapping list. Example: if your USB drive is fs3, then type fs3: and press Enter.
  9. At the command prompt, type UefiFlash.efi, where is the filename of the .bio file and press Enter.Command prompt
  10. Press Y to begin the update.
  11. Wait for the BIOS update to complete.
    Wait for the update to complete
  12. The computer will restart when finished.
  13. Set the BIOS back to original settings:
    1. Restart the computer.
    2. Press F2 during start to enter BIOS setup.
    3. Go to Advanced > Boot > Boot Configuration.
    4. In the Boot Devices pane, disable Internal UEFI Shell.
    5. Go to Advanced > Boot Secure Boot.
    6. Enable Secure Boot, if it was originally enabled.
    7. Press F10 to save changes and exit BIOS Setup.