Ok not sure what is happening but I got the Deco X20-4G and set it up.

I set it up to use 4G. Connected to the Deco X20-4G, 1st via WiFi and that

worked fine. I then connected my Macbook Pro via network cable and that

worked fine. I checked network speed via both WiFi and network cable connection

and they both showed about 105Mbs download which is what was lower than 

what I got with the TP-Link MR600.

I then connected my main Deco M5 to the Deco X20-4G but it would not connect

at all. The Deco M5 is setup to run using DHjCP which the adress it got from the 

TP-Link MR600. I checked the DHCP on the Deco X20-4G and it showed 

192.168.68.1 as its IP and 192.168.68.50 as start IP for DHCP and 192.168.71.xx.

Don't remember the value of xx but for me that looks weird. I would have expected

192.168.68.200 or something like that.

Anyway. I reset the Deco X20-4G to use IP 192.168.8.1 and DHCP from

192.168.8.2-192.168.8.250. Restarted the Deco X20-4G, then waited until it

was up and running and then I connected the main Deco M5 to the Deco X20-4G

via a network cable as I do with the TP-Link MR600 but the Deco M5 will not connect.

I reconnected the TP-Link MR600, started it with all cables connected as I normally do

and the Deco M5 comes up right away.

So what am I missing here? I just want to get the Deco X20-4G up and running in the 

same manner as the TP-Link MR600 being my router to the outside world. 

William