Help Becker Be4721 Need code

Hallo everyone,

I have mercedes with Becker
today i denaturized shelling and the becker asked for code, i haven't these code, so please support me.

Model Becker traffic Pro BE4721
Serial Number : Y5020210

there are 10 Present buttons on front.

it's a CD Player + Radio Player + NAV

Please Help me if you can.

Thank You

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