Canon Service Tool 4905 May 2026
The Canon Service Tool 4905 is distributed in a grey area. Canon never authorizes end-users to access service mode. However, in many countries (including the US under the Magnuson-Moss Warranty Act), using third-party tools for maintenance does not automatically void warranty unless the tool directly caused damage.
That said:
You can legally download the tool from various tech forums (e.g., BadCaps, PrinterKnowledge) or GitHub repositories that reverse-engineered the protocol. Always scan downloaded .exe files with antivirus software—some repackaged versions contain malware.
Canon Service Tool v4905 is a specialized maintenance utility software used for resetting and servicing Canon inkjet printers. It is the successor to earlier versions (such as v3600 and v4700) and is primarily required for newer Canon printer models. The software allows technicians to perform "Waste Ink Counter" resets, clear error codes, and perform system diagnostics that are not accessible through standard printer drivers.
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If your printer is still under warranty, resetting counters or changing region flags will void it. The printer logs the last service tool access.
Resetting the counter does not physically empty the waste pads. If you reset the counter multiple times without eventually replacing or cleaning the pads, ink will leak inside the printer, potentially ruining electronics.
Best Practice: After 2-3 resets, open the printer and manually dry or replace the felt pads under the purge unit. YouTube has model-specific guides.
The "4905" version is specifically designed for Canon printers using newer firmware (circa 2018–2022). The most common compatible models include: The Canon Service Tool 4905 is distributed in a grey area
Note: Using the wrong version (e.g., v3400 on a TS3300) can brick your printer. Always verify compatibility.
Disclaimer: This process involves entering your printer’s service mode. One wrong click can corrupt the EEPROM. Follow exactly.
Q: Is Canon Service Tool 4905 free?
A: Yes, it is distributed for free online. Beware of scammers selling it.
Q: Will it work on macOS or Linux?
A: No. It requires Windows. You can run it via VirtualBox or Wine, but USB passthrough can be unreliable. You can legally download the tool from various
Q: My printer has error 6A80 (purge unit jam). Can ST4905 fix that?
A: No. 6A80 is a mechanical jam, not a counter overflow. You need to physically clean or replace the purge unit.
Q: Can I use it to make my printer use cheaper third-party inks?
A: Indirectly yes – resetting ink levels allows refilled cartridges to be recognized as full.
Q: Does Canon know if I used the service tool?
A: Yes. The printer logs the service mode entry and reset events. However, Canon only checks this during paid repairs, not remotely.