Connect your printer to your PC via (it will not work over Wi-Fi). Open the Service Tool V5103 executable.
To use the software, the printer must first be placed in Service Mode. This usually involves a specific sequence of button presses while the printer is connected to a computer via a USB cable. Once in Service Mode, the tool can communicate with the printer's firmware. Users should exercise caution, as incorrect settings within the tool can lead to a permanent "Main Board Lock," rendering the printer unusable. Canon Service Tool V5103 Download