1. A mobile terminal supporting Firmware Over-The-Air (FOTA) based data update, the mobile terminal comprising: a first memory comprising a pre-boot loading area, a bootloader loading area, and a FOTA engine loading area; a second memory comprising a first bootloader file area to store a first version bootloader file, a second bootloader file area to store a second version bootloader file, and a FOTA engine file area; and a control unit controlling a process of loading, in response to a boot related data update request, a newer version bootloader file corresponding to a newer one of the first version bootloader file and the second version bootloader file, in the bootloader loading area of the first memory, and updating, upon FOTA engine activation, a bootloader file area storing an older version bootloader file, corresponding to an older one of the first version bootloader file and the second version bootloader file, on the basis of received boot related data.