A programmable controller for operating a system is provided as well as a method and devices of configuring such controller. The controller includes firmware storing instructions for controlling operations of the system, the firmware including a passive memory component and a processing unit programmed for operating the system at least in part based on the instructions of the firmware. The firmware is responsive to a signal carrying firmware update information received from an external device for drawing energy from the signal to activate the passive memory component and causing a firmware update process to be performed. Advantageously, the proposed controller can be configured in the absence of electrical power being supplied by an external source and in, some embodiments, using the signal carrying the firmware update information as the sole source of electrical energy in order to perform at least part of the firmware update process.