Methods to singulate circuit forming regions of a circuit board substrate assembly includes providing a plurality of circuit forming regions including at least one pair of adjacent circuit forming regions separated by at least one opening defined in substrate material between each pair of adjacent circuit forming regions. The image-forming apparatus includes an acquisition unit configured to acquire the access-control information based on a signature included in the flow setting information if the flow setting information includes the signature, and a flow-performing unit configured to perform the flow based on the access-control information acquired by the acquisition unit. A locking interconnect portion attaches the grinding head portion to the body and is adapted to permit selective rotation of the grinding head portion relative to the body about the longitudinal axis of the body. It also provides the Owner the ability to secure and prevent unauthorized access to features and applications which could allow an unauthorized user access to sensitive data and equipment.