HP LaserJet Ent. M611dn

This printer is intended to work only with cartridges that have new or reused HP chips, and it uses dynamic security measures to block cartridges using anon-HP chips. Periodic firmware updates will maintain the effectiveness of these measures and block cartridges that previously worked. A reused HP chip enables the use of reused, remanufactured, and refilled cartridges. More at: http://www.hp.com/learn/ds