Resetting a printer requires precision. If done incorrectly, you risk permanently locking or "bricking" your printer's mainboard. Ensure you meet these requirements before starting:
Before the Service Tool can communicate with your MB2140, the printer must be in a special "Service Mode." Without this, the software will not recognize the device. YouTube·thecollegepicker Canon Mb2140 Service Tool
The mainboard may have entered an unrecoverable lock state, usually caused by using an outdated or pirated version of the Service Tool. Resetting a printer requires precision