You cannot use the tool if the printer is in normal mode. You must put the printer into Service Mode manually. This process generally follows this pattern (varies slightly by model):
Because Canon decided (for business reasons) that waste ink pads are a “consumable” that requires a paid repair center visit. When the waste ink counter hits its limit, the printer locks up completely—even if the physical pads are fine or have been changed. canon service tool v5204
The service tool bypasses that lock in 30 seconds. For free (in theory). You cannot use the tool if the printer is in normal mode
WIC Reset supports most Canon models and is regularly updated. The free version shows the waste ink level; a small fee unlocks the reset. No malware, no registry hacks. WIC Reset supports most Canon models and is