@Prisoneer Check this thread and you'll find the answers. If you've upgraded your Internet speed to 300mbps then you'll need a 1gbps capable (WAN/LAN) router to benefit form that.

@Gekkouga Yes, I got it right from your initial post. It's maybe just that your main router and WR840N are incompatible in that mode. Do you have another router which you can test with, to extend its...

@Gekkouga What's you main router make and model ? Can you try to set Static IP and put the 8.8.8.8 DNS like I posted - just to see if that will resolve the issue.

@jpkan Well, that's the other option. To be sure that you'll access the web management interface properly, take your laptop with you when buying a device and test that on site (if possible). You can...

@Gekkouga What's the LAN type of WR840N, Static IP or Smart IP ? If you've set Static IP, then go to DHCP settings and put 8.8.8.8 as a DNS server: Reboot WR840N and test. If the LAN type is Smart IP...

@jpkan This issue could be due to a several reasons, not even connected with the localization settings. It would be easier to ask your ISP to provide you with another device given your statement from...