After extracting both the USB flash utility and firmware file, double-click on the USBf lash Utility icon.
Confirm that the correct printer model is listed under Select Printer From List. If not, click the drop-down arrow to locate and select the correct printer.
Browse to the firmware file directory.
Select the required file and click Open.
Confirm that the correct firmware file is listed under Enter Filename To Flash To Printer.
Observe the progress bar to completion.
Observe the printer LEDs or LCD for flash status. A series of periodic LED light sequences is seen or a specific message appears on the LCD.
After completion, the printer should return to Ready.