The model I have will not come up on the drop down. I have a Deco AC1200 with 3 units. Model says it is Deco S4R (EU) Ver: 4.0. I had a problem with my Internet which got fixed and my router is fine and working. Now when I reconnect the TP Link it continuously blinks with a blue light. I have reset a couple of times and it still won't go solid. My phone finds the Deco unit but the tether app can't find it so I can fully re set up the mesh.