DH16A3S needed

the tray won’t open anymore, but device manager says, “This device is working properly.”

http://codeworks.cdfreaks.com/cgmirror/firmwares.html
i checked the list, but it doesn’t have my dvd burner.

“ATAPI DVD A DH16A3S 3A12 (ATA)” is a liteon in my acer aspire x1200.

where can i find the unscrambled .bin firmware?