If the correct series of Canon genuine ink cartridges is not recognized as installed in the MG3520, even after ensuring the restraining lever is snapped into place, then the MG3520 will need to be replaced. You are eligible for the Canon Upgrade Program, a one-time discount on the purchase of a replacement. If you're interested, more information is available through our phone-based Canon Direct agents at (866) 443-8002. You will need the printer's serial number to confirm eligibility.
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