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Dell OptiPlex 5055 Small Form Factor Owner's Manual

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Flashing the BIOS from the F12 One-Time boot menu

Updating your system BIOS using a BIOS update .exe file copied to a FAT32 USB key and booting from the F12 one time boot menu.

BIOS Update

You can run the BIOS update file from Windows using a bootable USB key or you can also update the BIOS from the F12 One-Time boot menu on the system.

Most Dell systems built after 2012 have this capability and you can confirm by booting your system to the F12 One-Time Boot Menu to see if BIOS FLASH UPDATE is listed as a boot option for your system. If the option is listed, 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 will need:

  • USB key formatted to the FAT32 file system (key does not have to be bootable)
  • BIOS executable file that you downloaded from the Dell Support website and copied to the root of the USB key
  • AC power adapter connected to the system
  • Functional system battery to flash the BIOS

Perform the following steps to execute the BIOS update flash process from the F12 menu:

  • CAUTION: 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 Enter. Displays one time boot menu
  3. The Bios flash menu will open then click the browse button.Displays one time boot menu
  4. The E5450A14.exe file is shown as an example in the following screenshot. The actual file name may vary.Displays one time boot menu
  5. Once the file is selected, it will show in the file selection box and you can click the OK button to continue. Displays one time boot menu
  6. Click the Begin Flash Update button. Displays one time boot menu
  7. A warning box is displayed asking you if you want to proceed. Click the Yes button to begin the flash. Displays one time boot menu
  8. At this point the BIOS flash will execute, the system will reboot and then the BIOS flash will start and a progress bar will show the progress of the flash. Depending on the changes included in the update, the progress bar may go from zero to 100 multiple times and the flash process could take as long as 10 minutes. Generally this process takes two to three minutes. Displays one time boot menu
  9. Once complete, the system will reboot and the BIOS update process is completed.
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