Close the Service Tool V3400 application. Press the physical button on the printer to turn it off. Wait 10 seconds, then power the machine back on normally. Your printer is now fully unlocked and ready for everyday operation. Critical Safety and Troubleshooting Advice
: Using version V3400 on newer printer models (like the G-series or newer MG models) can permanently lock the service mode
This article is for informational and educational purposes only. The author does not condone downloading or using proprietary Canon software outside of authorized repair channels. Proceed at your own risk.
