As HP puts it: "Starting in early May 2012, HP will update various ink cartridges. The updated ink cartridges are compatible with both current and future printers that use these ink cartridge numbers. They have been developed together with future devices to provide new features. Cartridges that were available before spring 2012 will not be compatible with certain printers and all-in-one devices that will be launched in 2013."
This means that older cartridge models cannot be refilled for newer printers (with the same printing unit)! In this respect, we differentiate between the old series (AS) and the updated (=new) series (NS) for different HP ink cartridges. You can "easily" distinguish the old and the new series yourself, check the warranty expiration date on the front of the cartridge. Attention, the date format is printed in the American spelling and is YYYY/MM/DD (year/month/day). These models are affected:
This concerns the article numbers CH561EE, CH562EE, CH563EE, CH564EE
Old Series: Warranty date before 01.07.2014 - New Series: Warranty date after 01.07.2014
This concerns the article numbers F6U65AE, F6U66AE, F6U67AE, F6U68AE
Old Series: Warranty date before 14.05.2019 - New Series: Warranty date after 14.05.2019
This concerns the article numbers N9K05AE, N9K06AE, N9K07AE, N9K08AE
Old Series: Warranty date before 11.08.2019 - New Series: Warranty date after 11.08.2019