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Once you have the latest firmware downloaded, extract the zip file and locate the firmware flash (.fls) file.
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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.
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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.
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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.
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Update the firmware. Refer to “Updating printer or MFP firmware using a USB thumb or flash drive.”