Canon iR5055 Series Service Manual page 616

Chapter 18
3) When the session has ended, click [OK].
4) If you want to start another downloading session, see the appropriate instructions.
5) When you are done with downloading, turn off and then on the main power.
6) See the upgrade status indicated on the control panel. When a message appears asking you to turn off and then on the switch, 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. The ongoing session will be suspended
and the machine may fail to start up.
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