Patent ID: 8091083

Claim:
An electronic apparatus, comprising: a first communicator that performs communications with an external host computer; a second communicator that performs communications with an external maintenance computer; a rewritable memory that stores a control program that controls an operation of the electronic apparatus, and a first communication program; an unrewritable memory that stores a second communication program; a first inspector that judges whether the control program is normal, and a second inspector that judges whether the first communication program is normal; a first downloader that downloads a replacement control program from the external host computer by way of the first communicator under the control of the first communication program, in a case where the first inspector judges the control program is not normal and the second inspector judges the first communication program is normal; and a second downloader, that downloads a replacement first communication program from the external maintenance computer by way of the second communicator under the control of the second communication program, in a case where the second inspector judges the first communication program is not normal, so that the first communication program stored in the rewritable memory is rewritten with the replacement first communication program downloaded by the second downloader.