Power off the printer.
Press and hold the buttons 2 + 7 + 8 simultaneously. Click here to view image.
Power on the printer while still holding the buttons down. In about 20 seconds the “USB Recovery” message appear at the top of the screen.
Note: If the LCD screen is blank or the USB Recovery Mode text does not appear, continue to hold down the 2 - 7 - 8 button combination until you hear a beeping sound.
Once you hear the beeping sound, release the buttons and then proceed with the next step. Otherwise, repeat Steps 1 – 3.
At this point, you are able to perform the firmware update. To know how to download and update the firmware, click here.