Hi i first bought 3x Deco X50, one is set as a master (in AP mode) and connected via ethernet to my router, the others just have power cable connected and have solid green light
then i thought "oh cool lets get more of these" (i have a big house)
now i unboxed another 3 of them and i thought i could just connect them to with power cable and they would just fit into the existing Deco Mesh Network, but in fact they dont, they are just blinking blue.

can you even have more then 3 in one deco network? if yes how? i cant see any option to add new Decos into an existing Network.

thanks for any help!