Hi, I would like to find the original firmware of my drive. I think it was a Philips PBDV 1640, but I had flashed it to BenQ DW1620 some time ago. While looking through pages for a new update I happened to look at the face of my drive and noticed a “DVD + R DL” printed on it. I had never noticed this before and after scouring through some sites I noticed that the Philips SPD 2400BM looked exactly like my drive. Is it possible I have had Dual Layer drive all this time, which had the PBDV firmware on it and not even known? If so, does anyone know where I can get my hands on the Philips SPD 2400BM firmware to bring my drive up to what it should be?