What does the DS19 fw actualy do on the 166s

am new to lite-on products, have just bought a lite-on 166s dvd-rom and a lite-on 411s write (unfortunatly for me.

am not realy having any problems with the dvd-rom its the writer, it wont actualy write dvds at the moment, thats another story though.

whilst just looking for any new firmwares out, i noticed a unoficial ds19 for the dvd-rom but cabt find anywhere about what it does, can anyone tell me, anbd it is better than the standard ds18 which i have now?