Since this is an unofficial technician's tool, it is not available on official Canon support sites. It can be found on several third-party platforms:
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Disclaimer: This article is for informational purposes only. We do not provide or host downloads for any Canon service tools. Always use official software from Canon Inc.
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While still holding Power, release Resume, then press it (or 6 for some models).
This is the most dangerous part of the process. Searching for "download service tool v3400 printer canon hot" will lead you to dozens of websites – many of which host malware, ransomware, or trojan-infected files. Since this is an unofficial technician's tool, it
If you run the software without putting the printer in "Service Mode" first, or if you use the wrong version for your specific model, the printer will freeze. This is known as a "locked" board and usually requires a physical chip replacement.
