I believe it was a bad flash. I think the problem was the cvt file of the B7T9 firmware, or have you used the B7T9.exe from the BenQ site??
I'm a bit confused, what drive have you, the Phlips 1640 or Philips 8631. I thuoght only the Philips 1640 and 1620 had the nightrider leds. Isn't the Philips PBDV8631 the oem drive without the leds. Or am I just getting old, yes I'm over 43 and way over the hill. I'll stop before I'm getting senile