If you use the wrong version of the tool or try to reset the printer too many times without success, you can "lock" the printer's firmware permanently. This is known as a "Service Mode Lock" and usually requires a hardware chip replacement to fix. Important Maintenance Tip
Allows you to read and save the printer’s internal data. Free Download Canon Resetter Service Tool St 5510
I can provide more specific instructions for your exact model. If you use the wrong version of the
Runs deep diagnostics to check nozzle health. I can provide more specific instructions for your
Once your printer is in Service Mode and connected via USB (Wi-Fi resets are not supported), follow these steps: Open ST5510.exe .
Turn the printer off and back on. The error should now be gone. A Note on "Free Downloads" and Safety
Many sites offering "free" versions bundle the software with viruses or trojans. Always scan .exe files with updated antivirus software.