If you want, I can produce model-specific instructions (exact service-mode steps, menu names, or a step-by-step reset procedure) for one Canon model — tell me the printer model.
Service Tools for Canon Printers | Page 4 | PrinterKnowledge canon service tool v.4718
: It allows users to enter "Service Mode" to update firmware, reset ink counters, or clear persistent error codes after hardware repairs like logic board replacements. If you want, I can produce model-specific instructions
For cartridge-based printers (PGI-250/CLI-251), you can buy a physical "Resetter" dongle for $15 on Amazon. This is safer because it doesn't require PC software. If you want