@DanielDT Look at my post $4 the RE gateway IP address is your main router LAN IP address, i..e 192.168.0.1 (if you use the 192.168.0.0/24 subnet). Once you set the RE with static IP address...

@garasakal If it's not properly configured TL-WA850RE can cause similar behavior. I would recommend to set TL-WA850RE with a static IP address like 192.168.X.254 (X - depends on what your VR400 LAN...

@bilb1 Use this FAQ to troubleshoot your issue. If it's about a DSL modem router go through this FAQ.

@Gfrixz To be reset successfuly the reset button should be pressed for about 10 seconds. Here's how to unbrick your router. If neither works for you contact your local support for assistance.

@Ihsan_H If you put the ISP router in bridge mode you can use one of your Deco units as a router straight away because they support router mode. If you insist to have a separate router in your...

@Jarro You can switch out modem and network input without doing the whole setup from scratch. If the ISP device can be set in bridge mode (modem only) you can continue to use your old setup as it is....