Just discovered on the LiteOn firmware site
At last a new firmware for the 1613:
DR16AS06.zip Windows 564 KB 2005/03/09 Match more media
I don't think that this will be a popular download as most owners can add +DL by using 1633/1653 firmwares, but it shows that LiteOn did not forget that they ever made these drives.
Still waiting for that superfirmware to replace BS0S!