likely refers to a specific build or interface version. Multiple variants exist (V5100, V5103, V5110), often modified by different cracking groups. The “5103” does not correspond to a Canon internal version number; it is a label applied by the tool’s creator.
EEPROM Operations: Allows users to read and save the printer’s EEPROM data, which contains the device’s entire history and configuration. canon service tool v5103