@PauloMS 

What is the current light status of the 3 Deco? Are they all solid green? 

With modem connected to the main Deco only, please connect your computer to the main Deco and test whether you can access internet; then click here to check its IP address and default gateway. 

Meanwhile, what is the current internet IP address and gateway obtained by the main Deco? You can find them via  the Deco app. 

Besides, try to reboot the modem and all the Deco units to give it a go. 

@PauloMS 

Glad to hear that it was resolved finally, thanks for your feedback.

Any further problem, do not hesitate to contact us.

Wish you enjoy the internet with the Deco nodes. 

@Steveg 

Hello, what is the firmware version you installed?

Try to reboot the Deco M5, or change another socket to plug it;

You can hold the reset hole for 1s with the Deco powered on and verify whether it works.

Besides, may I know when did you buy this Deco M5?

Good day.