The printer must be able to enter "Service Mode". If the EEPROM is permanently locked, the tool will fail License Mechanism:
In the world of printer maintenance, particularly for Canon’s extensive lineup of inkjet printers, there exists a piece of software that sits firmly in the "professional only" category: . For technicians, repair shop owners, and advanced DIY enthusiasts, this version number—v5103—represents a specific gateway to low-level printer diagnostics, waste ink pad counters, and hardware recalibrations that are inaccessible through standard driver software. canon service tools v5103
Release the Power button. If the power light stays steady (not blinking), the printer is in Service Mode. The printer must be able to enter "Service Mode"
The designation is a specific version release. In the service tool lineage, v5103 is widely recognized as one of the most stable and compatible versions for Canon PIXMA printers manufactured between 2010 and 2018. It supports a broad range of printer models, including the popular MG series (MG2520, MG3020, MG3520, etc.), MX series, and certain imageCLASS models. Release the Power button