To use any version of the Canon Service Tool (including v6000), the printer be in "Service Mode": Turn off the printer but keep it plugged in. Stop/Reset While holding Stop/Reset, press and hold the Release the Stop/Reset
Ultimate Guide to Canon Service Tool V6000: Top Features and Printer Resetting
The V6000 version supports an extensive range of Canon series, making it more versatile than older versions like V3400.