A contact spring assembly for an electronic device includes a mounting portion, a press spring, and a deformable spring. A circuit board, which includes a control circuit, is installed to an axially outer surface of a main body of the rear frame. When power is applied to the platform, a control signal is used to prevent power-up of the platform’s processor related circuitry. This error condition includes the occurrence of excessive collisions or late collisions. In particular, he present method comprises assigning a code to products, that is transferred upon ordering the products into bonus-credits and is saved in the account of the user. The renewed master key is distributed in such a form that can be processed by a specific device via a transmission medium such as a recording medium, network, IC card, telephone line, for example, via a tree-structured distribution system.