Abstract: A printer having multiple processor cores, and a firmware rewriting method for the printer, enable rewriting firmware in a short time. A first rewrite controller controls rewriting the firmware of the first core by the boot program of the first core; a second rewrite controller controls rewriting the firmware of a second core, which is one of the multiple cores other than the first core, by the boot program of the first core; and a reset unit resets the printer after rewriting the firmware of the first core and the firmware of the second core by the boot program of the first core ends.

Abstract: A device control program can be updated even when the printing device is busy. A control method of a printer 2 having a storage unit 32 storing a device control program 36 and a boot program 37, and a communication interface 21 that communicates with a host device 1, includes: a receive change-mode request step of receiving a change-mode request from the host device 1 through the communication interface 21; a change mode step of changing from a normal control mode in which the device control program 36 runs to a boot control mode in which the boot program 37 runs based on the change-mode request; the communication interface 21 receiving a change-mode request in the receive change-mode request step even if the communication interface 21 reports being busy.

Abstract: A printer having multiple processor cores, and a firmware rewriting method for the printer, enable rewriting firmware in a short time. A first rewrite controller 74 controls rewriting the firmware of the first core by the boot program of the first core; a second rewrite controller 75 controls rewriting the firmware of a second core, which is one of the multiple cores other than the first core, by the boot program of the first core; and a reset unit 76 resets the printer after rewriting the firmware of the first core and the firmware of the second core by the boot program of the first core ends.