A system for updating firmware on electronic devices, including an electronic device including a processor, a storage for storing a current image of firmware that includes a baseline image of firmware, an update utility for updating the firmware stored in the storage, and a connector for connecting the electronic device to a jacket, and a jacket including a storage for storing a firmware difference image for updating the firmware in the electronic device to a newer version, and a port for connecting the electronic device connector thereto, wherein the update utility instructs the electronic device processor (i) to apply the firmware difference image to the baseline image of the firmware to generate a newer version image of the firmware, and (ii) to replace the current image of the firmware in the electronic device storage with the thus generated newer version image of the firmware.