Use a hardware maintenance box resetter (available on sites like AliExpress). Align the resetter's pins with the contacts on the box's chip.

Every Epson EcoTank printer has a built-in counter that tracks how much ink is collected in the waste ink pads during head cleanings and normal operation. Once this counter hits a specific limit, the printer locks itself to prevent ink overflow, resulting in a "Service Required" error. There are two main ways the L6270 tracks waste ink:

Using a "hot" resetter improperly can permanently damage your printer’s motherboard. Follow these steps precisely. This process is for the Epson L6270 only (not the L6275, L6290, or L6170, though they are similar).