@Aeefy You're with the latest FW for C5400X(US) so far. The beta FW in question has been released to solve a prarticular problem with OOKLA Speedtest feature. It has earlier release date, which means...

@Fahl If you are trying to port-fporward Synology NAS services through your router then take a look at this video. For enabling Synology FTP access on your router check this resource as well as this...

@ashton1502 Have you tried to change the ethernet cable with a new one (CAT 5E/6) or the port of the device to which the AX10 WAN port is connected ?

@Fahl This happens because the DMZ IP address should be in your C7 LAN IP address range. Thus, if your C7 LAN IP address is 192.168.1.1 or 192.168.0.1, the DMZ IP address should be in the same subnet...

@HolySrulik Have a look at this story. It could help you through the process of bridging VR600 to your Deco system.

@Tanvir-Siam That's up to TP-Link's R&D department. Here you can file a feature request: