Fitlet3: BIOS Update

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  • This page contains information of how to update the fitlet3's firmware.
* BIOS update recommended in case the system is unstable, or required fixes have been released. * Incorrect BIOS update has a risk for system brick, therefore follow the guide step-by-step.

Preparing the USB Flash Drive with BIOS Updater

  1. Connect your USB Flash Drive (UFD) to your computer and format it to FAT32 file system
  2. Download and extract the latest fitlet3 BIOS ready package
  3. Copy the extracted files to the prepared UFD
  4. Disconnect the prepared UFD and connect it to the target fitlet3 unit.
  5. Power up the fitlet3 unit.
  6. Press the F7 key during the boot until the "Select boot device" menu appears (it may take a while).
  7. Select the UFD on the menu and press ENTER.
  8. The system will boot to the EFI Shell and after 5 seconds the automatic script will start.
    Note: Do not press ESC while the countdown.
  9. The BIOS flashing process will start.
  10. Follow on-screen instructions


  1. The first boot after the BIOS update might take a long time and several restarts.
  2. For Windows users only:
    1. After the BIOS update, the new undefined devices will appear in the Device Manager.
    2. Please install the PSE drivers:
  Windows 10:
  Windows 11:

BIOS flashing without USB device-support