Managing HP 950, HP 951 serial numbers
For all we know HP printers with these cartridges memorise the last 3 serial numbers of the cartridges that where used.
A cartridge printed empty can be refilled twice and with ignoring the warning messages from the printer can be used to print normaly. But when trying it the third time the printer refuses to work properly. That is if you use the same cartridge three times in a row.
We recommend using different cartridges. Make sure that the cartridge you use is not bound to a special printer by the HP cartridge protection. That would limit the usability of the cartridge.
How to manage using refilled cartridges HP 950, 950 XL, HP 951, 951 XL
To avoid a printer that refuses to work it is best to have 4 sets of cartridges for HP 950, 951. To handle the correct order of the cartridges we recommend marking them. The 4 serial numbers for each colour make sure that in the fifth cycle of printing the printer does not memorise the serial number of the cartridge used first. In this way it is possible to use refilled HP cartridges in your printer by rotating continuously.
![](https://www.octopus-office.de/info/fileadmin/_migrated/pics/prozess_seriennummern_HP950.jpg)
Features of the HP 950, HP 951 cartridges:
So far there is no possibility to reset the chip on the cartridge. But as with nearly all printers it is possible to disable or ignore the ink filling level indicator and continue printing. Another way is to exchange the original chip with a new one from us (see right). The ink filling level is correctly displayed afterwards.
![QU-Fill™ PROFI for HP® 932, 950, 953, 970, 980 and Primera spring valve cartridges, brass QU-Fill™ PROFI for HP® 932, 950, 953, 970, 980 and Primera spring valve cartridges, brass](https://www.octopus-office.de/shop/media/image/7a/a2/c5/efill-Tool-f-r-HP-932-950-953-970-980-Primera-053464-053461-053462-053463-LX-1000-LX-2000.jpg)
![HP 950XL, 951XL chips for black, cyan, magenta and yellow ink cartridges HP 950XL, 951XL chips for black, cyan, magenta and yellow ink cartridges](https://www.octopus-office.de/shop/media/image/8e/76/53/hp_950_951_XL_chip_set_resetten_tintenpatrone_druckerpatrone.jpg)
![Ink Refill Kit for HP 933, 940, 951 color Ink Refill Kit for HP 933, 940, 951 color](https://www.octopus-office.de/shop/media/image/60/24/b9/Druckertinten-Nachfllset-HP-933-940-951-color-druc5a13e87e03692.jpg)
![Octopus Refill Ink for HP 932, 940, 950 pigmented black Octopus Refill Ink for HP 932, 940, 950 pigmented black](https://www.octopus-office.de/shop/media/image/5b/32/4d/nachfuelltinte-HP-940-950-black-pigmentiert-jpg.jpg)