A method and a device are proposed for controlling andor diagnosing a control system influencing a mass flow. The method includes receiving a Diameter message associated with a mobile device. The substrate has a layered structure of an organic insulating layer and a metal layer including at least one internal metal layer. \u201cThe piezoelectric material layer 32a existing within a portion where the first mask 131 does not exist\u201d is eliminated by injecting a blast media including at least one of abrasive grains or an organic solvent onto the first principal surface 20a of the substrate 20.