I have a 2002 Lexus SC430 with the original DVD Nav disc Ver 2.1, some one on this site sent me a PM, that they had an update disc for sale ver 7.1, I agreed paid them and I received the DVD copy (non-OEM), I installed the DVD and now I am getting an error with message "incorrect program disc" "please install correct program disc" messages.... I contacted the seller and now he is saying that I needed a ver 4.1 or 5.1 before installing the 7.1.... The original 2.1 version does not work, I read that I cannot return to the original settings without having the dealer reset the system....
Can anyone help me ...thanks
