Because ZTE does not provide public firmware downloads directly to consumers, you must rely on trusted community forums or your ISP’s technical support portal.
: The firmware update process can sometimes be complex and may require technical knowledge. If you're not confident, it's advisable to seek help from a professional or your ISP's technical support. Zte F670l V9.0 Firmware Fixed
Do not turn off the device, unplug the cable, or refresh the browser while the green progress bar is running. The router will automatically reboot once completed. Troubleshooting a Brick / Soft-Locked Router Because ZTE does not provide public firmware downloads
The admin dashboard (192.168.1.1) becomes unresponsive after a few days of uptime. Step-by-Step: How to Flash the Firmware unplug the cable