If you tell me your (e.g., Pixma MG3620, TS9120, G7020, etc.), I can help you find the official or safe community method to fix the waste ink error without needing v4718.
To use the V4718 tool, the printer must be placed in . This typically involves a specific sequence of button presses: Turn off the printer. Hold the Stop/Reset button. Hold the Power button. Release the Stop/Reset button while still holding Power. canon+service+tool+v4718+updated