A firmware updating system and a method for updating the same are provided. The firmware updating system comprises an image updating device and an embedded device. The image updating device comprises a first storage device and a merging module. The first storage device is for storing a first header and a first file system. The merging system is for merging the first header and the first file system to output a first image file. The embedded device comprises a second storage device and a self-updating module. The second storage device is for storing a second image file. The second image file includes a second header, a second file system, and a third file system. The self-updating module is for updating the second file system of the second image file as the first file system according to the first image file.