Hello! I can help you with resetting the admin password for your ZTE ZXHN F670L router. Here are the steps you can follow:
1. Locate the reset button on your ZTE router. It is usually a small hole that requires a pin or paperclip to press.
2. Power on your router and press and hold the reset button for about 10-15 seconds until the router's lights start flashing.
3. Release the reset button and wait for the router to reboot.
4. Once the router has rebooted, you can access the router's web interface by typing its default IP address (usually 192.168.1.1 or 192.168.0.1) in your web browser.
5. Log in using the default username and password. The default username and password for ZTE routers are usually "admin" for both the username and password.
6. You can now set a new admin password for your router to secure your network.
Remember to choose a strong password that is not easily guessable to ensure the security of your network. Let me know if you encounter any issues during the process.