I am having a similar problem to the user above.
I bought the BenQ 1620 OEM version from Newegg. Just go it and installed it today. It does not recognize any disk that I put in it. I've set it up as the Master drive on the IDE chain, just as my cd burner had been.
I downloaded the G7K9 firmware executable from BenQ's website and ran it. I tried the B7K9 firmware patch first because I wasn't sure, but the program said "match not found" or something. So I tried the G7K9, which claimed it was successful. I tried re-booting, but Windows wouldn't shut down properly. I had to manually reboot. I've never had to do this after installing new hardware.
After running the firmware upgrade, the drive still does not recognize any disks. Windows Explorer shows the drive as "ATAPI DVD DD 2x16x4x16"
Device Manager shows it is working properly.
I tried downloading WinDWFlash.exe, but only found a version that was WinDWFlash.rar instead. I don't have the program to run WinDWFlash, so I tried renaming it to a .exe and running it. A Dos window popped up, then an error message, "encountered an illegal instruction." I also had trouble downloading the B7P9 driver from the website you've referenced.
What am I missing? Please help!
Thanks a million,
-Alan