hi. i have a n3 and wanting to install in my brothers car but every disc that i put it, it reads not compatible. i had updated my n3 with new discs and now i dont have the disc for the most recent update. i forgot where i saw on how to reset everything to read the original 1st version disc that i have. how do i reset it, anybody remember? id hate to spend money on the latest disc but instead i can reset and use the original disc. a lil help please? thank you!