Requires a direct USB connection. It will not work over Wi-Fi or Ethernet Service Mode:
If you have a PIXMA TS3120, TS3320, TR4520, or G7020 , do not use v5103. You need CST v5400 or newer. Using v5103 on these models can permanently lock the EEPROM. canon service tools v5103
With the printer off:
The software provides a wide array of functions, but the most frequently used features include: Requires a direct USB connection