Canon iR6570 series Service Manual page 656

Chapter 17
3) When the result of the downloading session has appeared, click [OK].
4) If you want another downloading session, see the appropriate instructions.
5) When you are done, turn off and then on the main power.
6) See the status of upgrading indicated on the control panel. When a message appears asking you to turn off and then on the machine, turn off and then
on the main power.
Be sure never to turn off the power while the machine is executing a downloading session or writing downloaded software. Otherwise, the ongoing session
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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