METHOD FOR CREATING INVERSE DELTA FILE AND METHOD FOR RECOVERING FIRMWARE USING THE SAME

摘要

A method for generating a reverse delta file is presented to recover a firmware into an original state easily when firmware update fails or is cancelled. According to a method for updating firmware using a delta file, a reverse command code of a command code included in a delta block is grasped, and data offset of the reverse command code is grasped on the basis of data offset of the delta block(520). A reverse data block is generated by grasping recovery length or recovery data on the basis of patch length or patch data of the delta block(530). Correction is performed for an original file block using the delta block. The generated reverse data block is written at the position where the delta block is written(560).