Hewlett Packard Laserjet P4014/P4015 Firmware Updates If you are planning on updating the firmware on either of these models you must first remember to disconnect any optional accessories (Tray 3 Feeder, Envelope Feeder,etc) prior to starting the update process. Sometimes the update can cause the unit to not recognize the attached accessories. Reattach the accessories after the update is complete and you should experience no issues.