I just purchased a DW1650, and have found in the past that updating to the latest firmware is a good idea with DVD burners (A stack of bad archive DVDs from my LG 4160B is testament to this, until I updated the firmware for Ritek discs).
I found a link in the Benq/Philips Firmware thread to the Europe site
Interestingly, the US site had an older firmware than the Europe site. While the Australian site has neither:
Should I update to BCHC? (Listed on the Euro site, but not US)
If I do update, do I have to install BCDC first (silly question, I think I know the answer, but I’ve never owned a Benq drive before, and the approach to burning and firmware seems different here)