Model: DVP 1650S
Operating System: Windows 3.1 (Note: might work with other versions of this os.)
Firmware for BenQ DVDROM 1650S ( Windows Version ) .
If you have older base firmware 5.AV or 5.BV installed you first need to upgrade to 5.CV , or you cannot upgrade to a higher/newer version. If you already have 5.CV or higher base firmware installed you can update immediately to the latest version. ( Windows based firmware upgrade utility ) .