Canon Service Tool is not an official consumer product. Use it at your own risk. Incorrect use can permanently disable your printer.

Note: this guide assumes the Service Tool V3400 is the vendor-provided utility for programming/updating devices and that “Better Chip” refers to a firmware/driver update or patch for a device chipset. If your hardware or vendor uses different names, substitute accordingly.

He was looking for a specific set of digital keys. A piece of software that existed in the grey zones of the internet. He typed the mantra of the underground repair brotherhood into the search bar:

Canon Service Tool v3400 is a official-turned-public software utility used by technicians. It communicates directly with your printer's EEPROM (memory chip) to perform advanced maintenance.