To find the right chip reset tool, search the web for 'Epson cartridge chip reset tool' along with the exact model of your printer (e.g., WT-7620). Different models' cartridges have different numbers and arrangements of pin holes. The pins on the reset tool must line up with your cartridge's holes, which are on the bottom or side edge. A cartridge reset tool is a plastic device with pins that, when inserted into the pinholes on your cartridge, reset the chip inside.
