The Canon Service Tool exists in many versions: v3400, v3600, v4720, v5103, v5204, v5301, v5900, v6210, v6310, v6400, and more.
Resetting the electronic counter magically empty the physical sponges inside your printer. If you reset the counter without cleaning or replacing the physical waste ink pads, ink will eventually overflow, causing permanent damage to the printer’s internal circuitry or your furniture. Step 1: How to Put Your Canon Printer into Service Mode canon service tool v5204 upd download
The Pro-300 (large format) has not been confirmed to work with this tool. The Canon Service Tool exists in many versions:
Before the Canon Service Tool can communicate with your printer, you must place the printer into Service Mode (also called Maintenance Mode). The exact button sequence can vary slightly between printer models, but the following procedure works for many Canon printers: Step 1: How to Put Your Canon Printer