August 14 2015 OTA Update Ruined My Note 2

It looks like the latest AT&T OTA update from August 14, 2015 has ruined my Samsung Galaxy Note 2 SGH-I317 smartphone. The phone was rooted after the official KitKat 4.4.2 update but no custom recovery was installed. I postponed the last update for as long as possible but finally it was forced to install. Now the phone just displays the initial "Samsung Galaxy Note II" logo for a couple of seconds and turns off right away. I can't enter the safe mode.I can use system recovery buttons combination but it does not open the recovery menu. It simply restarts the update process showing AT&T logo, then "Installing..." and "Updating..." screen with the percentage progress bar. After reaching 100% and saying "Update completed" the phone reboots and shows "Samsung Galaxy Note II" logo again for a couple of seconds and then turns off. Please help with advice.