Tech blogs often provide clean, scanned copies. One reliable source is the website, which offers a dedicated download for the Canon Service Tool V5306 (ST5306).

This occurs if a wrong version of the Service Tool was used previously. The physical EEPROM chip on the motherboard may need to be replaced. Crucial Maintenance Warning

Close the software. Turn off the printer. Repeat the Service Mode button-pressing sequence carefully. Make sure you use a USB cable and avoid using a USB 3.0 (blue) port; try a USB 2.0 port instead. Error Code 005

Ensure your printer is connected via a high-quality USB cable. Wireless connections typically do not work for service tools. Run the Tool: