Because the Service Tool is technically proprietary software intended for authorized repair centers, it is not hosted on public Canon consumer download pages. You must acquire it through trusted third-party technician archives or tech support forums. Important Safety Checklist
The Canon Service Tool if your printer is turned on normally. The program will freeze or display error codes like Error 006 or Error 005 . You must manually boot the printer into Service Mode first. Step-by-Step Service Mode Sequence: canon service tool st6000 download
Release the button (keep holding Power), then press Stop 5 times (or 6 for some MG models). Because the Service Tool is technically proprietary software