Ensure your router is specifically V3 . You can check this on the bottom label or the web management page under "System Tools" > "Firmware Upgrade".
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Replaces restrictive custom provider settings with standard configurations, helping unlock standard operating options. Ensure your router is specifically V3
Once the router restarts, it is highly recommended to it to ensure the new firmware settings take full effect: tplink tlwr850n v3 firmware download india fixed 2021