First method: When the router is on, turn it to the backside to access rear connectors and buttons. Second step, find Reset Button, then press and hold it for over 10 seconds. All Archer C9 LED lights should flash a few times. Then, give TP-LINK router a minute or two to reboot and restore its normal operation. Fantastic!
Re:Archer C6: Cannot enable WPS (slider is disabled) @tony.ganchev. read note below: configure wifi right parameters first. you have probabbly enabled/on "hide SSID" for wifi network. switch Hide SSID to disable/off or check other wifi parameters/conditions for enable WPS. #2.

TP-Link Archer C6 V3.2 unboxing and quick setup with Speed test on 100Mbps planTP-Link Archer C6 Gigabit MU-MIMO Wireless Router:

The "This Article Applies to" section is not updated in a timely manner, to determine if your model supports a specific feature, please refer to the Specifications page of the corresponding product on the TP-Link website.
How to set up TP-Link Archer C6U via web browser How to set up TP-Link Archer C6U via Tether app Feature Filter: All Q&A of functional explanation or specification parameters Configuration Guide User Application Requirement When You Set Up Troubleshooting
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how to configure tp link archer c6 router