: While some older versions like V3400 might be found for free, V3900 and newer versions (V5103, V6000) are typically paid or require a specific activation key based on your PC ID. How to Use Service Tool V3900
: The tool’s most common use is resetting the waste ink counter to 0%, allowing the printer to bypass internal blocks that stop it from printing when it "thinks" the absorbers are full. Canon Service Tool V.3900 Download
Using unofficial service tools may void warranty and could be against Canon’s terms. Do not share or distribute copyrighted installers. : While some older versions like V3400 might
: Clears the counter value for the waste ink absorber, allowing the printer to resume operation after a "Service Required" error. V3900 and newer versions (V5103