Review on 🖨️ Smart Ink Replacement Ink Cartridge for HP 902 XL 902XL (4 Pack) Advanced Chip Technology | Compatible with Officejet 6951 6954 6956 6958 6950 Pro 6968 6974 6975 6960 (Black L & C/M/Y) by Harry Ashcraft

update 5-14-19. Some time ago HP updated the firmware so I couldn't use this company's product as shown in the review below. The company did me right. They have upgraded their cartridges and my printer no longer complains about non-genuine ink. If Smart Ink continues this trend I will continue to use it until I run out of a printer. HP OfficeJet Pro 6978 I have allowed the printer to be updated having used this product for the last 2 refill purchases. The update ended the ability to use this product. It's either that or the last batch of cartridges isn't good for HP at all. I can no longer buy them. I have almost a whole set that no longer works. Good luck with any other model or don't update.