Buy a new Maintenance Box (Part Number: C13T04D100) and replace it.
Here is the information regarding the resetter, including the tools needed and the procedure. resetter epson l6270
: If you reset the chip on a maintenance box, you must ensure it isn't physically overflowing with ink. Many users choose to replace the internal sponge or the entire box (the Epson L6270 Maintenance Box is widely available) to avoid mess or printer damage. Buy a new Maintenance Box (Part Number: C13T04D100)