Release the button. The green light should flash and then stay solid.
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A local printer repair shop can reset your printer using the genuine Canon Service Tool for a small fee ($20-40) – often cheaper than the damage a bricked printer or infected computer would cause. Release the button
For many newer Canon printers (including those compatible with v5510), Canon has released an official waste ink reset tool through their support website. It's free and legal, though Canon limits it to 3-5 resets per printer (after which the physical pad must be replaced at a service center). canon service tool v5510 free download patched