Hi i have a 95 audi a6 and i need the 4 digit code to unlock it from SAFE mode, on one of the stickers on the side of the radio it says "BLAUPUNKT" and "Gamma CC Bose US". When i go to enter the 4 digit code just guessing before the first digit in the four digit code can only switch from 1 to 0 so im guessin it starts off with a 0 or a 1 if that's all i can switch it to, im guessing if i include the serial number you may get this code if so that'd be awesome thank you!