Keep the button pressed for . The LED indicator lights will flash rapidly and then shut off. Release the button. Wait 2 to 3 minutes for the ONT to fully reboot.
Once you have a potential password, follow these steps to access the dashboard:
The ZTE F6640 is a high-performance Wi-Fi 6 Optical Network Terminal (ONT) widely deployed by internet service providers (ISPs) to deliver gigabit fiber internet. Accessing its admin gateway allows you to change your Wi-Fi name, set up parental controls, and configure port forwarding.
WPS allows devices to connect via a PIN code or button press, but it features known vulnerabilities. Disable it within the WLAN settings to close this security loophole.
The ZTE F6640 has two levels of access:
If you cannot find the sticker, common default credentials for ZTE routers include: IP Address: 192.168.1.1 How to Access the Admin Panel
Once it boots back up, try the default credentials listed on the sticker again.
Check the original setup guide, contract, or welcome email sent by your internet service provider.
Go to product viewer dialog for this item. Password Guide: Default, Reset, and Configuration The Go to product viewer dialog for this item. zte f6640 password
Disclaimer: Passwords vary by firmware version and ISP customization. This guide is for informational purposes to help owners access their own legally purchased hardware.
To log into the router configuration page, open a web browser and enter the default IP address: (or 192.168.0.1 on some ISP firmware).
This write-up is for educational and troubleshooting purposes only. Unauthorized access to network devices may violate your ISP’s terms of service.
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Enter your new password. As recommended by Afrihost , use at least 10 characters including uppercase, lowercase, numbers, and symbols. Click or Save . 4. Troubleshoot: Forgot Password
You can now log in using the default IP address and the original password printed on the router's sticker. 6. Crucial Router Security Best Practices
192.168.1.1 (most common) or 192.168.0.1. Default Username: admin or user . Default Password: admin , 1234 , or Web@0063 . How to Log In
Under the WLAN security settings, ensure your encryption mode is set to WPA2-PSK (AES) or WPA3 if your devices support it. Avoid outdated WEP or WPA options. Wait 2 to 3 minutes for the ONT to fully reboot
For safety, change both the administrative login password and the Wi-Fi security key immediately after logging in. Change the Router Admin Password Go to or Administration . Select User Management . Enter your old password. Type and confirm your new secure password. Click Apply or Save . Change the Wi-Fi Password Navigate to the Local Network or WLAN tab. Select WLAN Basic or WLAN SSID Configuration . Look for the WPA Pre-Shared Key or WPA Password field.