Using this tool is a "high-stakes" operation. If handled incorrectly, it can permanently "brick" the printer’s logic board. Canon service tool v2000 | Page 21 - PrinterKnowledge
When a printer reaches its pre-set page limit, it assumes the internal waste ink pads are saturated and stops printing to prevent leaks. The Service Tool allows you to: Clears the 5B00 error code. canon service tool v4713 download link
Release both buttons. If the power light stays green (not blinking), you are in Service Mode. Using this tool is a "high-stakes" operation
Due to the nature of service software, it is important to download from a secure source. canon service tool v4713 download link