I would like to upgrade the firmware on my Ativa 18x external LH-1H18AX but can't find any firmware updates. Has anyone successfully upgraded the firmware on this model? I also have an Ativa 18x "internal" LH-1H18A and successfully updated the firmware from Codeguys http://codeguys.rpc1.org/firmwares.html using the Lite-On LH-18A1H firmware update. Any help would be appreciated.