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    VCDS not connecting with AUDI A4 B7 Concert EU B7 solo radio, without CD changer

    Hi! Recently wanted to add aux for my radio, so i connected VCDS to a car. I can open and manage many other things, but VCDS is not connecting with radio. It shows -"controller is not responding". After that, connected cable to VW Touran and it connected to Radio successfully. To mention...