HP standard printers are printers available without the benefits of HP+. HP standard printers, however, are intended to work only with cartridges that have a new or reused HP chip or circuitry, and they use dynamic security measures to block cartridges using a non-HP chip or circuitry.  Periodic firmware updates will maintain the effectiveness of these measures and block cartridges that previously worked.  A reused HP chip or circuitry enables the use of reused, remanufactured, and refilled cartridges.