i bought my 96 A4 about a month ago, and seeing as it's almost 20 years old, it needed some maintenance. My friends father is a mechanic so i took it to him, and during his working on it, he had to unhook the battery resetting my radio. My friend then tried to unlock it but didn't know how. Now, my radio is displaying Safe Code II and wont let me enter the code that i need to. My grandfather tried unhooking the battery again but it still displayed that. anyone know how to totally reset it?