@Marvin_S this is exactly what I have done but the deco app, while searching for the other decos (E4R) does not find them. I've tried powering them on and off. I even had them next to the deco base...

I recently upgraded my home WiFi to ghz speed and have an X55 3 pack that are working fine. I have an older DSL E4R pack and would like to know if the models are compatible. I want to put the E4R's...