The invention relates to a mobile radio set for a cellular network. The modular base assembly also includes a gear housing supporting the drive flange assembly. In certain embodiments, adjustments, such as a toe lift function, are automatically performed after about three strides of the transfemoral prosthetic device user andor when each of the strides has a stride speed of at least about 0. According to the invention, the PSD further comprises means operatively associated with at least one of the mechanical and hydraulic transmission systems for storing and releasing energy within the PSD transmission, the energy storing and releasing means comprising a flywheel or an accumulator or a combination thereof. In response to determination of the appropriate upgrade path, a version specific program upgrade component and a version specific upgrade program are associated with the determined upgrade path.