IKONG 950XL 951XL Compatible Ink Cartridge Replacement for HP 950 951 Ink Cartridge Works with HP OfficeJet Pro 8600 8610 8620 8100 8630 8660 8640 8615 8625 276DW 251DW 271DW HP 8600 ink Upgrade Firmware Support: Click "IKONG" below the price,then enter "Ask a question" on the Top right to the next page to contact us,with any "damaged cartridge" emails replied in less than 24 hours 7/7. What is included: IKONG Compatible HP 950XL 951XL Replacement HP 8610 Ink Cartridge ( 4-pack,1 Black,1 Cyan,1 Magenta,1 Yellow) Compatibility of HP 951 ink cartridges: HP OfficeJet Pro 8600 8100 8610 8620 8660 8630 8640 8615 8625 251DW 276DW and 271DW printers 950XL ATTN: Any errors like HP 950 "damaged cartridges",an updated firmware will fix the self-induced problem.Please download the latest firmware on HP's official website based on your printer model,and only by updating the firmware can continue to use our cartridges. IKONG 951 ink-Smart Technology: Remaining Ink levels accurately reported for compatible hp 8620 printers,etc-same as OEM capability. One-year limited warranty. If you encounter the errors like&#034;damaged cartridges&#034;on your HP OfficeJet Pro 8610, 8615, 8620, 8625, 8630, 8640, 8660 series printers,an updated firmware will fix the self-induced problem.Here&#039;s the method for your reference: 1. Download the latest firmware on HP&#039;s official website based on your printer model: Support --&gt; Software and Drivers --&gt; Printers type <br> 2. Update your printer to the latest firmware version then you can use our cartridges well. Officejet Pro 8620 Officejet Pro 8600 Officejet Pro 8660 Officejet Pro 8630 Officejet Pro 276dw Officejet Pro 251dw Officejet Pro 271dw Officejet Pro 8625 Officejet Pro 8615 Officejet Pro 8640 Officejet Pro 8100 High Capacity Amazing Printouts Smooth Printing and No Plugging Nozzle. After new cartridges installed, if streak happens,try re aligning your printer heads,then hit your printer clean option and that should take care of this issue.