The present invention relates to a method for amending the firmware of a device with limited resources, the device comprises a memory unit, and a firmware amending software, and the firmware comprises: at least two functional components, wherein the first functional component comprises at least one public function, configured to be called by at least one second functional component different from the first functional component, a functional component table, wherein at least one of the functional components is registered, a call dispatch unit, where each call addressing one of the public functions is dispatched, wherein the firmware amendment comprises the steps for the firmware amending software of: storing a new functional component at a memory location of the memory unit, updating the functional component table with the memory location of said new functional component, and handing over control to the firmware.