Firmware Update Method and Firmware Update System Thereof

A firmware update system to enable a firmware providing end to update a computer system, wherein the computer system has a memory module and a first firmware image file written therein, the firmware update system comprising:

• a first setting module for writing a first identification code into the memory module;
• a second setting module for setting a firmware update file on the firmware providing end to make the firmware update file include a second firmware image file and a second identification code;
• a comparing module, after receiving the firmware update file at the computer system, determining whether the firmware update file conforms to a custom structure according to the first identification code;
• and
• an update module electrically connected to the comparing module;
• wherein if the firmware update file does not conform to the custom structure, then the update module prohibits the firmware update image file from updating the computer system;
• if the firmware update file conforms to the custom structure , then the update module replaces the first firmware image file with the second firmware image file and writes the second firmware image file into the memory module of the computer system along with the second identification code.