Older Canon printers used a specific "Factory Mode" entry method (usually holding the Stop/Reset button) that allowed these generic Service Tools to communicate with the printer. However, the Maxify series utilizes a different firmware architecture. Many of the popular, older reset tools (V3400, V3600) found for free online with the MB2140. Attempting to use incompatible software can corrupt the printer's EEPROM, rendering the device permanently bricked.
Canon’s official stance is that the waste ink pad is a requiring replacement at an authorized service center. However, many users successfully reset the counter using third-party software. That’s where the Canon Maxify MB2140 reset tool comes in. canon maxify mb2140 reset tool download