BENQ dw2050 couldn't read disk!

[qanda]This thread is about the BenQ DW2000. Click here to see full specs[/qanda]I have a dw2050.I flash it to 6B33.The file 6B33WIN.exe download from BENQ website.Now,it couldn’t read disk!Insert a blank disk,tell me “please insert a disk!”.I flash it to 9B3A ,but is the same problem.I din’t know ,what shoud i do!Help me!:bow: