Method of Writing Firmware, Firmware Storage Medium, and Electronic Device

摘要

Writing only incompatible firmware is reliably prevented without limiting writing other firmware. A firmware storage area is reserved in printer memory, and an evaluation area for writing evaluation data is reserved in the boot sector at the beginning of the firmware storage area. When the firmware overwriting process starts, the printer control unit gets the evaluation data, which is firmware data overwritten to a fixed address set as the evaluation area, and based on this evaluation data determines whether to complete or abort the firmware writing process.