The router will automatically reboot. Do not unplug the device during this time. Troubleshooting Common Upgrade Issues
“free-firmware-download(dot)com” or pop-up ads claiming “F670L Speed Upgrade.” These are 99% malware.
Look for two lines:
Step 1: Check Current Firmware Version and Hardware Revision
If you can tell me your and current firmware version , I can try to help you find a more specific download. Zte Zxhn F670l Firmware Download HOT-
If you choose to venture into the world of unlocked firmware, do so with a full understanding of the risks involved. For most users, the built-in auto-update feature or a direct check within the router's admin page is the best path to a secure and reliable internet connection.
If you are looking for specific versions for technical reasons or security audits, the following have been documented: The router will automatically reboot
Because the F670L is typically provided by an ISP, the update process is usually managed remotely.