Troubleshooting Guide for ZTE F668: Resolving Wi-Fi and Device Connectivity Issues

This guide provides step-by-step instructions to resolve common problems with your ZTE F668 router, such as frequent Wi-Fi disconnections and other devices being unable to connect.

Step 1: Accessing the Router Interface

Open a web browser and navigate to the router's IP address:

URL: http://192.168.1.1

On the ZTE login page, enter the following credentials:

Username: admin
Password: password

Click the Login button.

Step 2: Viewing Device Information

After logging in, click on the Network menu, then select Status, and then Device Information.

This section displays important details about your ZTE F668 device:

Model: F668
Serial Number: 709F2D-ZTENQBCEC800067
Hardware Version: V5.2
Software Version: V5.2.10P3T1
Boot Loader Version: V5.2.10
PON Serial Number: ZTEGC12FF0DD
Password: GC12FF0DD
Batch Number: 07dfP3T100d2

Step 3: Configuring WLAN Basic Settings (QoS Type)

Navigate to Network > WLAN > Basic.

In the QoS Type section, select your SSID from the dropdown menu and click the Submit button.

Tip: Changing the Wireless RF mode from disabled to scheduled may take a minute or so. Please refresh the page after the change.

Current Wireless Settings:

Wireless RF Mode: Enabled
Enable Isolation: Enabled
Mode: Mixed(802.11b+802.11g+802.11n)
Band Width: Auto
Channel: Auto
SGI: Enable
Beacon Interval: 100 ms
Transmitting Power: 100%
QoS Type: WMM
RTS Threshold: Disabled
DTIM Interval: SGRV
WMM: Enabled

Step 4: Configuring Firewall Settings

Go to Security > Firewall.

To enhance security:

Check the box for Enable Anti-Hacking Protection.
Set Firewall Level to Off.

Click the Submit button to save the changes.

Step 5: Configuring UPnP Settings

Navigate to Application > UPnP.

To enable UPnP:

Check the box for Enable.
For IPv4 WAN Connection, select omci_ipv4_pppoe_1.

Click the Submit button to apply the settings.

Step 6: Rebooting the Device

To apply all changes and ensure the router is functioning correctly, a reboot is recommended.

Go to Administration > System Management > System Management.

Click the Reboot button to restart the device.

Note: Clicking 'Restore Default' will reset the configuration to factory settings and reboot the device.

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