Canon Service Tool 6000 2021 -

Look at the top of the interface. If the options are greyed out, your printer is not properly in Service Mode or the USB connection is unstable.

The Ultimate Guide to Canon Service Tool V6000: Reseting Waste Ink and Printer Maintenance canon service tool 6000

If the software throws an "Error 006" message, it means the tool cannot communicate with the printer. This happens if you forgot to enter Service Mode, used a bad USB cable, or have other printing jobs stuck in your Windows print queue. Look at the top of the interface

While the numbering suggests a specific series, the "6000" tool generally supports: used a bad USB cable

Set the dropdown menu to Main (or All depending on the model variant). Click the Set button right next to it.