Once you have the latest firmware downloaded, extract the zip file and locate the firmware flash (.fls) file.
Printer must be in a Ready state or set the printer to Invalid Engine Code state.
Note: Contact Lexmark Technical Support on how to set the printer to Invalid Engine Code.
Make sure that NO other option cards are installed in the device, as these options often require specific firmware to operate properly. To do this, print a Menu Settings page and look for these options listed under Installed Features or Installed Options.
Note: Failure to ignore this step will cause the update to fail, and it can potentially lead an unrecoverable error.
Determine whether your printer is connected via local (USB cable) or network (Ethernet or wireless) and make sure both computer and printer are communicating properly.
Update the firmware. Refer to “Updating printer or MFP firmware using a USB thumb or flash drive.”