"I spent three days trying to get Canon Service Mode Tool v1.050 to work on a Pixma MG5420. After fighting driver signatures, installing a VM, and disabling antivirus (red flag #1), the tool detected my printer — but every command gave a 'Timeout error.' Turned out the cracked DLL was corrupt. Finally found a clean copy on an obscure Russian forum. Reset the waste ink counter successfully. Then two weeks later, the printer refused to turn on. Might be unrelated. Might not be. Would I do it again? No. Next time I’m buying an Epson with a reset key." — Anonymous forum post, 2019
using a specific sequence of button presses (typically involving the Power and Resume/Stop buttons). Security and Availability Service Tools for Canon Printers | PrinterKnowledge 1 Jul 2016 — canon service mode tool version 1.050 download
The tool allows technicians to bypass standard user controls and interface directly with the printer’s EEPROM (Electrically Erasable Programmable Read-Only Memory). This grants access to critical functions such as: "I spent three days trying to get Canon Service Mode Tool v1