Hi there, I am new here.

Today I have changed my two Zyxel access points for the Deco X60 (3 units)

I have connected the first (main) Deco X60 to my Zyxel T56 router.

The other two Deco X60 are on the first floor and second floor.

The Deco app on my phone tells me that everything is ok, all signals are green.

But when I am on the second floor there is no wifi anymore, no signal.

But the Deco app is still green.

If I choose the wifi on my phone it tells me the password is incorrect.

I have followed the instrunctions. Does anyone know what I am doing wrong here?

At one point in the instructions it says that I have to switch off the wifi on my router. 

And then turn off the router.

Connect the X60 and turn on the X60 and turn on the router again.

The wifi signal on the router is back on.

Does that interfere with the fist (main) Deco X60?

Do I have to switch the wifi off again?

Hope you can help me out.