Canon iR6570 series Service Manual page 676

Chapter 17
4) Click [OK].
5) When you are done with downloading, turn off and then on the main power.
6) See the status of upgrading indicated on the control panel of the machine. When a message appears asking you to turn off and then on the switch, turn
off and then on the main power.
Be sure not to turn off the machine while it is executing a downloading session or writing downloaded system software. The write operation will be
suspended, and the machine may fail to start up.
If the machine fails to start up, format BOOTDEV using HDFormat, and then download system software to be stored in the HDD such as System,
Language, and RUI.
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