Using V3400 on newer printers (those requiring version V4720 or higher) can permanently lock the printer's service mode. This makes it impossible to use any service tool in the future.
is specifically known in the printer repair community as the last version that works locally without requiring a paid license or cloud-based login from Canon. Google Groups Key Features of Service Tool v3400 5B00 Error Resolution : It is the primary software solution for fixing the service tool v3400 download better chip
Hold the button (red triangle) and press the Power button. Using V3400 on newer printers (those requiring version