The solution would be to go to a representative of the car and there you will receive the code for the radio.
Well, many, we may not have radio code at all (we lost it, bought a second hand car and was not included, you entered a wrong code too many times, etc). You remain without the car battery or change the battery, and radio no longer starts, asks you to enter the code! Normally the radio code have been noted somewhere on the manuals that you’ve got with the car, or you have a card that contains the code for the radio. I am convinced that many of us needed a car radio code at least once in a lifetime.