123.hp.com/envy4520. 123hp.info simply assist customers to Setup, Install and Troubleshoot HP Envy model Printers. Check if the firewall software installed on your computer is hindering the communication between your computer and printer. In that case, disable the firewall temporarily and go ahead with the print job. Switch on the firewall once you have completed printing the pages. If your 123.hp.com/envy4520 printer is still not responding after performing the above-mentioned steps, then, try restarting the computer as well as the printer. All the trademarks and images that are mentioned on the website are only for the information to the users. We disclaim that any ownership or rights to any third parties unless stated. Download the driver software from the following link 123.hp.com/envy4520 or 123.hp.com/setup envy4520.