Users on some forums have noted minor changes after P5N2 :
: Full IPv4/IPv6 dual-stack compatibility for future-proof networking. How to Update Your ZTE F670L V9.0 Firmware zte f670l v90 firmware fixed top
: Features a 4 kV lightning protection design for the adapter and 1.5 kV for Ethernet/POTS ports. The "Fixed Top" Firmware Review Users on some forums have noted minor changes