Canon does not publish Service Tools on public websites. Legitimate acquisition channels include:
Warning: Many third-party websites offering “Canon Service Tool V.4906 free download” may contain malware, trojans, or keyloggers. Files found on forums, file hosts (MediaFire, Mega, 4shared), or torrents are frequently modified or outdated. Software Canon Service Tool V.4906 Download
This software allows users to access the "Service Mode" of supported Canon printers. It is primarily used to: Canon does not publish Service Tools on public websites
Assuming you have obtained a verified copy and accepted the risks, here is the standard procedure to reset a waste ink counter on a compatible Canon printer (e.g., MG3520, MG5520, MG5720, MP495). or keyloggers. Files found on forums