@ERE What is the model number of the extender? Is it the RE650? What about the main router? What is the hardware and firmware version of the main router? Have you ever tried to update the firmware...

@luker Hi, to make Tether app find the extender, they should be in the same subnet. Try to connect your smart phone to the extender's wifi directly, not main routers or others. And then you can...

@TP-AC2600-RE650 What is the model number of your device? Is it RE650? The AVM 6591 you mentioned is a Fritz box. For the firmware of RE650, you can click...

@ShaneJP The RED internet LED indicator means that there is no internet. With internet cable plugged into the WAN port of the Archer C20, please check the led status. If it is still red, please login...

@Loki_Law What do you mean by saying all devices cannot connect to the router? Do they unable to get internet or they cannot access the web UI of the router? If they cannot get internet, please tell...

@Sicnarf It was detected as unidentified network, that is why you cannot access the web UI of the router. Try to right click on ethernet connection and disable it and re-enable it. Or change another...