Firmware GCAB which I believe is newer then your update BCAB am I correct in assuming that. I just bought this DVD burner at Staples and mfg 11/2005
The newest BenQ firmware for the 1655 is BCDB. Check out this review thread to see the differences between it and GCAB and reasons why (and why not) to change.
If you decide to change, you’ll need to download the BCDB.zip firmware from BenQ and follow the instructions in Zebadee’s BenQ & How to be a FLASHER! thread.