Flashing the BIOS from the F12 One-Time Boot Menu

Flashing the BIOS from the F12 One-Time Boot Menu



Summary: How to update your system BIOS using an update .exe file that is copied to a USB key and booting from the One-Time Boot Menu.


BIOS Update

Warning: BitLocker should be disabled before updating the BIOS or the BitLocker recovery key will be needed after the update.

The BIOS update file for your system can be run from inside Windows. From a bootable USB key on systems with the option, you can update the BIOS from the F12 One-Time boot menu.

Most Dell systems built after 2012 have this function and you can confirm by booting your system to the F12 One-Time Boot Menu. If you see BIOS FLASH UPDATE listed as a boot option for your system, then the BIOS supports this BIOS update option.

Note: Only systems with BIOS Flash Update option in the F12 One-Time Boot Menu can use this function.

Updating From the One-Time Boot Menu

To update your BIOS from the F12 One-Time boot menu. You need a USB key that is formatted to the FAT32 file system (the key DOES NOT have to be bootable). The BIOS executable file that you downloaded from the Dell Support Website, should be copied to the root of the USB key. You need the AC power adapter connected to the system and a function system battery to flash the BIOS.

Here are the steps to execute the BIOS update flash process from the F12 menu.

WARNING: DO NOT POWER OFF THE SYSTEM DURING THE BIOS UPDATE PROCESS. Powering off the system could make the system fail to boot.
  1. From a power off state, insert the USB key where you copied the flash into a USB port of the system
  2. Power on the system and press the F12 key to access the One-Time Boot Menu. Highlight BIOS Flash Update using the arrow keys then press the Enter key. (See Figure 1.)
    Dell One Time Boot Menu
    Figure 1. - Selecting the BIOS Flash option on the F12 one-time boot menu.
  3. The BIOS flash menu opens, click the browse button. (See figure 2.)
    Dell BIOS Flash Menu
    Figure 2. - The Flash BIOS menu browse selection from the F12 menu.
  4. In the Browse pop up window, you should see the BIOS flash executable file that you copied to the USB drive (E5450A14.exe), the file name varies. (See Figure 3.)
    Dell BIOS Flash Menu
    Figure 3. - Selecting the BIOS flash in the pop up menu
  5. Once the file is selected, it shows in the file selection box and you can click the OK button to continue. (See Figure 4.)
    Dell BIOS Flash Menu
    Figure 4. - After the BIOS flash file is selected and you click the OK button.
  6. You can now click the Begin Flash Update button. (See Figure 5.)
    Dell BIOS Flash Menu
    Figure 5. - Clicking the Begin Flash Update button
  7. A warning box appears asking you if you want to proceed. Click the Yes button to begin the flash. (See Figure 6.)
    Dell BIOS Flash Menu
    Figure 6. - Clicking Yes in the Do You Want to Proceed warning box.
  8. The BIOS flash starts, the system reboots and then the BIOS flash starts and a progress bar shows the progress of the flash. Depending on the changes in the update, the progress bar may go from zero to 100 multiple times. The flash process could take 10 minutes, but generally this process takes two to three minutes. (See Figure 7.)
    Dell BIOS Update Screen
    Figure 7. - BIOS Flash Progress indicator
  9. Once complete, the system reboots and the BIOS update process is completed.

Note: For more information about System BIOS and how to Check and Update the BIOS on your Dell System:

If you have further questions about this solution, please contact Dell Technical Support.






Article ID: SLN305230

Last Date Modified: 01/13/2020 07:01 PM


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