Release all buttons. If the light stays steady green, you are in Service Mode.
Your printer will show an error code:
In the ecosystem of inkjet printing, few things are as frustrating as encountering a service error. For many Canon printer owners, specifically those with older models in the Pixma series, the "Error 5B00" or "Waste Ink Pad Counter Overflow" is an inevitable roadblock. In the search for a solution, users inevitably stumble upon the "Canon Service Tool V3600." While this software presents itself as a free, DIY fix for a costly problem, downloading and using it is a decision that requires careful consideration of technical risks, legal implications, and printer safety. canon service tool v3600 download
Once you , you run v3600 to reset the counter. Release all buttons