Im having trouble loading the new keys for the Ariza 700. When i go to parental Control, Pin, i input the factory pin # 0000, and the arrow shifts down to the "New Pin" i then input 0000 again, and the arrow shifts down to the "Confirm Pin" i then input the 0000 pin again, and it returns me back to the "old Pin" I believe there may be a pin already set for this receiver, how do i reset the pin.