HP DeskJet GT 5820 - A 'System Extension Blocked' Message Displays (macOS)

HP DeskJet GT 5820 - A 'System Extension Blocked' Message Displays (macOS)

This document is for HP printers and macOS Mojave (10.14) and Catalina (10.15).
When installing an HP print driver, a System Extension Blocked error message displays during driver installation.
Use Apple's Security and Privacy System Preferences to allow the required extensions to install for your printer to work correctly.
  1. Open the Security & Privacy preferences.
    • If the error message displays, click Open Security Preferences.
    • If the error message does not display, open the Apple menu, select System Preferences, and then click Security & Privacy.
  2. On the General tab, click Allow next to the HP Inc. was blocked from loading message.
  3. If a Legacy System Extension message displays, click OK.
  4. Restart the computer to finish the installation.

HP DeskJet GT 5810, 5820 Printers - A Blinking 'A' Displays During Alignment

This document is for HP DeskJet GT 5810, 5811, 5820, 5821, and 5822 All-in-One printers.
The printer is silent and displays a blinking A on the printer control panel.
The printer printed an alignment page and is waiting to scan the page and complete the alignment.
  1. Lift the scanner lid.
  2. Place the alignment page with the print side down on the scanner glass, and then position it according to the engraved guides around the glass.
    Figure : Place the alignment page on the scanner glass
  3. Close the scanner lid.
  4. On the control panel, press the Start Copy Color button .

https://support.hp.com/

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