That should be the retail version of the benq 1620. Also known as a rebadged benq 1620.
The most up to date fw for that drive,that I am aware of is: G7W9 I believe.
If using windows xp:
Go into device manager under dvd/cd rom drives.Open the tree/Locate that burner-and take note of what it tells you. Then double click that drive/click driver tab/uninstall/and reboot.
Sometimes a drive can get lost,and this uninstall-reboot will get it recognized.
When you open up the tree for dvd/cdrom drive and double click your burner: You may get a generic code like 8x16x8x16 dvd-rw or something like that.That for sure will tell you if it's a rebadged/retail version of the benq 1620. Then you can go to the dvd-rw drives forum under philips/benq drives for firmware advice.