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I had it too. - when I bought the used vehicle and was elated that it had a Jensen sound system in it. The sound was good - played a CD the first time I put it in. We listened to the radio after an hour and then attempted to replay the same CD. The ER-4 message showed up. The man who sold me the vehicle had given me the paperwork on the unit and I reset it. I've had to do this at least 4 times which means you have to reset all your favorite stations, time, etc.