If the E05C error persists after reinstalling cartridges, what should be the next step for a Canon G3010?

If the E05C error persists after reinstalling the cartridges, the next step would be to try cleaning the electrical contacts. Carefully remove the cartridges and gently wipe the gold electrical contacts on both the cartridges and inside the print head holder using a clean, lint-free cloth lightly dampened with distilled water. Ensure all contacts are completely dry before reinserting the cartridges. If the error still persists, a faulty print head or cartridge might be the cause.