Canon iR1020 Series Service Manual page 295

Never turn off the power switch of the machine while the data is being written to the flash ROM. If it becomes impossible to start this machine after turning its
power switch off, the image processor PCB must be replaced.
14) When writing of the data to the Flash ROM is complete, its result is displayed. Click the OK button.
15) When the Selecting a Job screen appears, click "Return to Main Menu".
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Chapter 17
17-13