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Please disconnect the USB cable from your scanner and then toggle the lock switch back and forth a few times, leaving it in the unlocked position.
Please open the cover and make sure that the scanning element is on the side with the buttons, not the hinge side.
Reconnect the USB cable an attempt to scan.
If the issue persists, I recommend reaching out to Canon support for your warranty options. You will need to register your Canon gear HERE to access additional support options.
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07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
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