How to mend Pioneer Deh-p6400

Error 11 When I insert a MP3 CD in my Pioner car music system?

model medialess ?

Unable to find my code. details are as follows, thanks for the help!!?

code for radio?

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I have lost my radio code can you help?

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used cassette car stereo?

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GM0303M1437958 (SC 303 (C))?

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