Canon MF735C Series Service Manual page 62

■ Prerequisite
In order to perform version upgrade of the machine using a USB flash drive, the following conditions must be met.
There should be no other jobs being executed.
Firmware cannot be upgraded while there is a job being executed. If there is a job being executed, wait for completion of the
job and then perform the work.
■ Procedure for Upgrading the Firmware Using a USB Flash Drive
1. Connect a USB flash drive where the firmware is stored to this machine.
2. Execute one of the following service modes.
• COPIER > FUNCTION > SYSTEM > DOWNLOAD
• COPIER > FUNCTION > SYSTEM > DOWNLOAD_FORCE
NOTE:
If you want to apply only firmware that is newer than the firmware currently applied in the machine, execute DOWNLOAD. If you
want to apply all the firmware contained in the USB flash drive regardless of whether it is newer or older, execute DOWNLOAD_
FORCE.
3. The signature data of the downloaded file is verified, and download instruction information is written to the
designated area of the flash memory only if the verification result is correct.
4. The machine is automatically restarted.
5. When the upgrading of firmware is completed, the machine automatically restarts.
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3. Technical Explanation (System)