Wondering how I can revert back to old firmware. After reading a post, I updated my Liteon SOHW 1633S which was at BS0Y to CS0T which was for the SOHW 1653S. I thought that would clear up the fact that my drive is not recognizing DVDs but to no avail. Is there anyway to revert back to the previous firmware? I tried using the BS0Y but it will not let me reinstall.