An image forming apparatus capable of updating a firmware of an optional device and method thereof are provided. The image forming apparatus includes a plurality of optional devices each having firmware, and a control part to compare the firmware of each device and update each firmware of the plurality...http://www.google.com.hk/patents/US20070169092?utm_source=gb-gplus-share專利 US20070169092 - Image forming apparatus capable of updating firmware of optional device and method thereof
