Using this tool requires precision. It is not a "plug and play" application; you must force the printer into Service Mode first.
A: Canon Service Tool V5100 and V5400 exist but are harder to find and often locked to specific technician IDs. Canon Service Tool V4905 Download -
Warning: This procedure will void your warranty (if still active) and may render your printer unusable if done incorrectly. Using this tool requires precision