Fiat 500 radio code

Hello,
There are only 3 solutions to legally recover the car radio code:

a) the car radio was installed by the car manufacturer, so the solution is to go to a dealership of the vehicle's brand with the paperwork (registration document) so they can provide the code. It's free or not, depending on the dealerships.

b) the car radio was purchased and installed by someone other than the manufacturer. You should either contact the store where you bought the car radio and do as mentioned above, or contact the manufacturer of that car radio who will provide the procedure to follow.

c) the car radio was in a used vehicle purchase, you just need to contact the previous owner to get the code or the proof of purchase if they no longer have the code.

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Very difficult to catch a black cat in a dark room.
Especially when it's not there...