@Tomcat_ from what I've seen online you should be able to do this, change the main Deco to router mode and then choose Dynamic IP for connection type.

@emrezgn You need to use the Deco app to set up IPV6. On Deco app go to More > internet connection > IPV6 and set from there.

@Mariusss What is the internal wiring in your house like? IE:- is your house relatively modern or an old house? Powerline adaptors are good except if your internal wiring is not of good enough...

@Sus_Deco Deco M5 is end of life now so I doubt any new features will be added to the model.

@Mariusss For gaming its always better to have a wired ethernet connection between the main Deco and satelite Deco. How far apart are the units and could you run an ethernet cable between them? The...

@cdpohl Assuming at the moment you have removed your Fritzbox and your main Deco is in router mode? You could put the Fritzbox back in and disable the wifi on it, then connect main Deco to Fritzbox...