1. A system controlled by a firmware, wherein the firmware comprises a set of non-programmable code to perform at least one key function and a set of programmable code to perform at least one normal function, the system comprising: a memory including: a first memory block that stores the set of non-programmable code of the firmware, a second and third memory blocks that include an active memory block and an inactive memory block, wherein the active memory block stores a first set of programmable code of the firmware that is currently being executed by the system and the inactive memory block stores a second set of programmable code of the firmware that is not currently being executed by the system, and a fourth memory block that stores firmware data, wherein the firmware data comprises a set of non-programmable data corresponding to the set of non-programmable code of the firmware and a set of programmable data corresponding to the set of programmable code of the firmware being executed by the system; and a processor, connected to the memory, comprising: an input unit that receives a new set of programmable code of the firmware and a firmware updating request, a processing unit, connected to the input unit, that executes the set of non-programmable code of the firmware stored in the first memory block and the first set of programmable code of the firmware stored in the active memory block, and a programming unit, connected to the input unit, that identifies the inactive memory block and stores the new set of programmable code of the firmware in the inactive memory block based on said identifying, wherein after said storing the new set of programmable code of the firmware in the inactive memory block based on said identifying, the processing unit switches from executing the first set of programmable code of the firmware stored in the active memory block to executing the new set of programmable code of the firmware stored in the inactive memory block based on the firmware updating request, and wherein the system continues to perform the at least one key function during said storing and switching steps.