@David-TP I do know the Passwort again, but when I try to connect with the router, it says that it's not possbible

@David-TP So it is the Model number you have mentioned. The 5GHz and the 2.4GHz did not lightened up and I forgot the password of the Router. The Tether App found my router but I am not connected to...

@David-TP I'm using the AC1900 MU-MIMMO Wi-Fi Range Extender.

Ich habe das Passwort vergessen, habe aber den Router vor mir. Der ist mit meinen PC verbunden aber es verbindet sich nicht mit der App.