This indicates that the software version does not support your specific printer model.
The service tool has the power to rewrite the printer's EEPROM. canon service tool v4720 download verified
Download the verified archive and extract the files using WinRAR or 7-Zip. This indicates that the software version does not
The tool detected a mismatch. This means the version of the Service Tool you are using (V4720) does not support your exact printer model. You may need to look for an alternative version like V5103 or V3400. wait 10 seconds
Turn off your printer, wait 10 seconds, and turn it back on normally. Safe Downloading and Avoiding Malware
The software cannot communicate with the printer firmware.