INKMATE 2 Pack Remanufactured Ink Cartridges for HP 64XL Tri-Color N9J91AN Use for HP Envy Photo 6255 7155 7855 Printer

Suggestions Because our products are re-manufacured, sometimes the printer will show the error message like "Cartridge is Damaged","Not compatible". If the printer shows the error message, please try our suggestions as following: 1.Please take out the ink cartridges and turn off the printer. 2.Then clean the chips of the ink carts with an eraser or some tissue. 3.Next please turn on the printer and put the items back. 4.Please choose to clean the printer head and sometime it needs to do for couple times.