Taken from this thread.
The CDFreaks thread about this tool can be found here.
LiteOn now official supports the tool and has a direct download to the newest version on their website. Download it here.
Note: Only the 411S/451S/811S/851S with firmware FS0G/GSB7/HS0J/GS0A work with this tool (listed firmwares are the earliest versions that will work, any firmwares that have been released since then will work as well).