is the 2007 TL DVD nav system able to read dual-layer DVD's? a friend of a friend who has an uncle who works next door to this guy provided me with a backup copy of the newest nav DVD. my system goes through the download update and i briefly get a red screen with info about putting the car out in the open for the GPS to set, but then I get a screen that says "incorrect disc". was wondering if it is because it is a dual layer dvd.