Canon Service Tool V3900 Download Top ((top)) Instant

Press and hold the button (red triangle in a circle). While holding Resume, press and hold the Power button. Keep holding Power , and release the Resume button.

This is the number one English-language resource for printer service tools. Look for threads with high post counts and "sticky" status. Members often share VirusTotal scans before uploading. The V3900 thread here has been active since 2021 with regular updates.