I remember this happening to a work Mondeo back in the 90s. One of our more gifted techs disconnected the car battery for some reason, then tried to guess the radio code when he replaced it! Needless to say, he didn't get lucky and the radio locked itself. We left the radio with the dealer, who had to get something from Ford to unlock it. It was many weeks before we got the radio back.
So it can be done, but you may be better off simply replacing it.
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MB Mondeo TDCi wagon, sea grey, on MAK Invidia 16" wheels.
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