Dear Sirs, I bought one DVD Cassette receiver Vide Model No CA-MXDK3, System No MX-DK3 and Serial No 101C0718. It was working fine at last weak. Now when i was plug in the mainscord in displays UPGRADE DISC. I am working in SONY Service in Coimbatore, I am a Service Technician. So, kindly request you to send me a mail for UPGRADE SOFTWARE or Service Tips. Thanking you Sir, With Best Regards Maheswaran

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