Tyjtyrjty 2x Compatible for HP940 Print Head C4900A C4901A For HP Officejet Pro 8000 8500 8500A 8500A Plus 8500A Premium 940 Printhead

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Notice:1. Please confirm PRINTER MODEL before order.2. If printer appears "Non-Genuine" or "Align Fail" or other error message, please click "YES" or "OK" or "NEXT" to continue, then printer can print.3. If the printer can't recognize printheads, please take off printheads, use eraser to clean the chips softly, install back and restart printer. (We advise you wearing gloves and prevent extra ink)4. If prints come with fading color, steak or broken lines at the first time you install new ink cartridges, please try to do Printer Head Cleaning once or twice. (Cleaning is in PRINTER SETTING)