The invention relates to a method for updating firmware of devices such as automation devices and/or energy management devices, including the process steps of: providing at least one firmware file; loading the at least one firmware file into a loading tool; connecting the loading tool to the device; and transferring the firmware file to the device in consideration of loading information. In order to enable the firmware updating of different devices by means of only one loading tool, the loading information according to the invention is hived off from the loading tool, stored in at least one external data source and loaded by the loading tool from the at least one external data source.