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Question: have a problem with car sd Sony cdx-s2000

I remove my battery from my Landy and my Sony cdx-s2000 became recoding instantly(get locked and only flashing in red all keys simultantly ,doesnt work). I bough sony with car and havent instructions, codes, etc. no warranty :( Please if some body cnows how to decoding/unlocking my car sd , please help me. Thank you