Open a web browser and enter the default gateway IP address (typically 192.168.1.1 or 192.168.0.1 ). Log in using your administrator credentials.
Official firmware links are generally not available on public websites. They are proprietary to ZTE and its partner ISPs. For most end-users, the safest and most appropriate firmware version comes directly from your Internet Service Provider (ISP). zte zxhn f670l epon firmware link