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I purchased it on ebay from someone in Indiana. The manual, remote and dash attachment came with it. I have read and followed the instructions in the manual and I can't seem to get it going. You can say its stolen but I assure you it isn't. I just need a little help thats all

I just purchased a Kenwood KVC 419 Head Unit. When I went to turn the system on it asked me for a security code. The manual has directions but they do not seem to be working for me. Does anyone have any clue on what I shouls do.