Hello @21MuhammedCan ,

Welcome to our community.

It seems that you are experiencing a situation where your device shows a 'Saved, Secured' message and you cannot access the internet when connected to your Range Extender's Wi-Fi (_EXT network), even though the signal lights are green.

Here are some steps you can follow:

• If only the Power light is on and other LEDs are off, or if the Signal light is red:
    • Make sure the extender is within the Wi-Fi range of your main router. Try moving it closer to the router.
    • Restart both your router and the extender.
    • If it doesn't help, perform a hard reset on the extender and set it up again.

• If the Signal/2.4G/5G lights are on:
    • Ensure your main router's Wi-Fi is working correctly by connecting a device directly to the router.
    • Restart both your router and the extender.
    • Update the extender's firmware to the latest version.
    • Disable any MAC address filtering or Access Control features on your router, as these can block devices from connecting. If you need help, please contact your router's support.
    • Compare the IP address your device receives when connected to the router and when connected to the extender. If they are not in the same network segment, enable the DHCP server on the extender. For detailed steps, visit: What's the solution if my TP-Link range extender can't connect to my router properly?