HP LaserJet MFP M234sdwe

Some HP printers are designed to work only with cartridges that have reused chips or electronic circuits from HP. These printers use dynamic security measures to block cartridges with a non-HP chip or a non-HP electronic circuit. Regular firmware updates maintain the effectiveness of these measures and can block cartridges that previously worked. Reused HP chips and electronic circuits from HP allow for the use of reused, remanufactured, and refilled cartridges.