Hi I recently replaced my P9 mesh wiht 3 Deco X50 which I have installed successfully. I am trying to connect 3 of the P9 decos to the X50 mesh but am struggling to do so. The P9s boot up ok but the deco application isn't finding them and they flash red. I have tried them via a wall socket as well as trying to connect them close to the main deco but no joy. I have also deleted the old network just in case there was a conflict. 

Any suggestions as it would be good to use the old decos to help enhance the mesh.