Canon LBP6670dn Series Service Manual page 134

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Trouble Shooting > Version Upgrade > Version Upgrade Using UST > Downloading the Firmware
7) Click the "Next" button.
8) Select the USB connection device, and click the "Next" button.
5 Trouble Shooting > Version Upgrade > Version Upgrade Using UST > Downloading the Firmware
9) Click the "Start" button.
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10) When the warning screen is displayed, click the "Yes" button.
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