LG 4120b firmware bitsetting problem

hi

i have a LG external dvd drive and I am trying to make it compatable with bitsetting so the dvd+r (dl) discs play as dvd-rom discs. there is an unofficial firmware called NOAD which i have tried to install but it just keeps on failing and bringing me an error with lots of zero’s. i saw on one of the websites that the external version is called 5120 and i have tried to update it with the 5120 firmware but it keeps giving me the same error. please can anyone help me find a solution. i am running windows xp home edition service pack 1.