@JunL Hi, welcome to our community. According the specifications on the official website, Deco E4 has 2× 10/100 Mbps Ports. So limited by the Ethernet port, the speed is no more than 100 Mbps from...

@JohnMerlin Hi, welcome to our community. Different Decos can work together. When addding E4, please power it on in the same room where the main X55 is. After setting it up successfully, you may...

@minhho Hi, welcome to our community. It is suggested to follow this thread to try the firmware recovery.

@andersostling56 Hi, welcome to our community. According to your description, my suggestions list below: 1. Connect Archer NX200 to LAN port of your Cisco router. 2. Set up EWAN mode on NX200,...

@Yacob Hi, welcome to our community. Is there LED on or flashing on the device? If you have tried different power sockets and the device still can not be turned on or reset, it may get defective. You...

@HiloPC Hi, welcome to our community. You may follow this guide to configure DDNS feature on the device: How to set up Dynamic DNS feature on TP-Link Modem Routers