For refilled HP 934/935 and HP 950/951 ink cartridge series printer models which display printer/cartridge error messages such as “missing or damaged”, “ink cartridge damaged”, “cartridge problem”, “replace cartridge”, “depleted ink cartridge”, etc., there is a new printer firmware update available for your printer model which will enable refilled ink cartridges to function normally.*
Click Here to Download New Printer Firmware Direct from HP
Locate your printer model and Operating System in the Solution section of the page and then click Download to begin firmware download. Refer to complete Printer Firmware Upgrade Steps below.
*HP printer firmware update is not available or required for the HP Officejet Pro 8600 and 8600 Plus printer models.
Refer to the main Support page for all other refill questions.