Procedures are the same for all printer models below.
1. Enter the menu: "Printer settings"
2. Click on "Support"
3. "Laserjet Update"
4. "Manage Updates"
5. Set the status to "Disabled" or "Off"
6. "Allow Updates", set "Yes"
7. "Ask before inst.", Set "Always ask"
8. "Allow Downgrade", set: "Yes"
9. Download the downgrade of your interest from those listed
10. Extract and open the file of your interest
11. Select the printer to update and click "Send Firmware"
12. Once downgraded go back to: Settings / Support / Laserjet Update / Allow Updates
13. Set "No" to prevent future updates.