“I have an pioneer avh-521ex and it's old. For some reason my option to use the usb port in back of receiver is unavailable. The usb icon is greyed out and we'll as the cd function. My question is did I delete something or what. It was registering yesterda”
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Hi Bud! Thank you so much for reaching out to us for assistance. In order to provide the best possible resolution, kindly give us a call at 1-800-421-1404. Looking forward to hearing from you. JC | Pioneer Support
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