Ensure the "USB Port" number appears at the top left of the tool.

The Canon Service Tool is a low-level software utility not intended for public release. It allows technicians to:

Canon Service Tool v5306 (5.306son versiyon 2020) 5B00 -客服

Elias clicked it. A user named PrinterGuru88 had posted a link.

Every Canon inkjet printer has physical sponges (absorbers) that catch excess ink during head cleanings. The printer doesn’t have a physical sensor to check if these are wet; instead, it uses a digital counter. Once that counter hits a specific limit, the printer locks itself to prevent ink from leaking out of the bottom. The v5306 tool is the key to resetting that digital counter to zero. Step 1: Finding a Safe Download

This article provides a comprehensive guide on what this tool is, how to get it, and how to install and use it safely. What is Canon Service Tool V5306?

The green light should blink and then stay solid. The printer is now in Service Mode. Install and Use Guide: Step-by-Step