Here’s a developed technical piece (user guide / troubleshooting style) for the controller. Understanding and Managing the Controller on the HP LaserJet M236sdw The “controller” in the HP LaserJet M236sdw refers to the printer’s main logic board and its embedded firmware. It manages all printer functions: processing print jobs, controlling the control panel, handling USB and network communication, managing print queues, and reporting error conditions.
Press and hold Cancel (X) button + Wi-Fi button simultaneously for 5 seconds. Or via EWS: Information → Print configuration page .