HP has released new firmware for its Officejet models blocking non-HP ink cartridges: the company actually did this last year but dialed back after complaints, so this convenience may just be temporary. Those who seek an immediate solution can try disabling HP’s “Dynamic Security Feature,” which reads security chips on ink cartridges for authentication. HP’s new firmware update seems to force HP’s Dynamic Security Feature to block non-HP cartridges. But there is a fix. HP provides a new firmware update on its HP support page that disables HP’s Dynamic Security Feature. Go to HP’s support page and search for a firmware update for your printer model. Download and install the new firmware. After deactivating the Dynamic Security Feature via firmware update, non-HP ink cartridges should be accepted again.