How to reset HP LaserJet Pro MFP M28 - M31 printer to factory-set defaults?

Restoring the factory-set defaults returns all of the HP LaserJet Pro MFP M28 - M31 printer and network settings to the factory defaults. It will not reset the page count. To restore the HP LaserJet Pro MFP M28 - M31 printer to the factory-default settings, follow these steps.

CAUTION: Restoring the factory-set defaults returns all of the settings to the factory defaults, and it also deletes any pages that are stored in the memory.

1. Open the HP Embedded Web Server (EWS):
   
   Direct-connected printers:
   a. Open the HP Printer Assistant.
      -  Windows 10: From the Start menu, click All Apps, click HP, and then select the printer name.
      -  Windows 8.1: Click the down arrow in lower left corner of the Start screen, and then select the printer name.
      -  Windows 8: Right-click an empty area on the Start screen, click All Apps on the app bar, and then select the printer name.
      -  Windows 7: From the computer desktop, click Start, select All Programs, click HP, click the folder for the printer, and then select the printer name.
   b. In the HP Printer Assistant, select Print, and then select HP Device Toolbox.
   
   Network-connected printers: 
   a. Print a configuration page to determine the IP address or host name.
       i.  Press and hold the Start Copy button until the Ready light begins blinking.
       ii.  Release the Start Copy button.
   b. Open a web browser, and in the address line, type the IP address or host name exactly as it displays on the printer configuration page. Press the Enter key on the computer keyboard. The EWS opens.
   NOTE: If the web browser displays a message indicating that accessing the website might not be safe, select the option to continue to the website. Accessing this website will not harm the computer.
   
   
2.  On the System tab, click Service.
3. In the Restore Defaults area, click the Restore defaults button. The HP LaserJet Pro MFP M28 - M31 printer automatically restarts.