I have successfully updated my Benq 800 to the 822 firmware B3EC. Burns DVD+R fine at 8x and DVD-R fine at 4x.
I went ahead and updated to the newest B3HC firmware for 8x DVD-R. I can't confirm the 8x DVD-R burning because I don't have any 8x -R media.
I think there is a good chance it will now accept the 822 DL firmware when released. How good it will work is a different story.
More details to come....