Canon printers enter service mode via button sequences during power-on (e.g., hold Stop + Power). In this mode:
Canon states:
“The waste ink counter is a safety feature. Resetting it without service leads to property damage or injury.” canon service resetter tool
With Canon’s move to secure microcontrollers (e.g., Renesas RX family), EEPROM access is locked via cryptographic handshake. Unauthorized resetting will become impossible without hardware key extraction. This will likely shift the cat-and-mouse game to firmware patching or microcontroller replacement – both significantly harder for consumers. Canon printers enter service mode via button sequences