The Canon Service Tool V5204 is an official service program designed for Windows operating systems. Canon engineers and authorized service centers use this software to communicate directly with the printer's firmware.

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Executes nozzle checks and grid alignments directly from the hardware level. Compatible Canon Printer Models

This happens if you opened the software before putting the printer into Service Mode, or if the USB driver is busy. Close the tool, reconnect the USB to a different port, and retry. Error Code 005