Wifi Password Reader No Root the tool you are looking for.
How to use Wifi Password Reader No Root? Very simple! Just open up your free app and you will see displayed on your device screen a list of scan wifi networks arround you. Just choose yours. In the following screen you will see the mac, the ssid name and a random wifi password generated for you.
The last step with Wifi Password Reader No Root is to set the generated pass to your router. You also can copy the passwords to your clipboard and send it to your computer to make this process easier!