@ICA-IT Now you should be able to update to the latest one TL-WR940N(EU)_V6_250925 from here.

@ICA-IT Your FW release is a rather old one and most probably you need to update with an intermediate release first. Try to update to this version first TL-WR940N(EU)_V6_180119 and then to a more...

@BartekBB For some domains the echo requests (pings) may haven't been allowed and that's why the preferred way to detect an Internet connectivity is the DNS resolution.

@Zedzzz Have you tried a manual FW update with another web browser ? If everything fails resetting the router to its factory defaults might help. You may take a router configuration backup before...

@Mikrt Here's how to change VR2800 operation mode to wireless router mode: A similar approach have been used in this thread.

@BartekBB The ideal solution would be a new FW releasse, but that's up to the TP-Link development team. I'm just pointing to a possible mitigation, described in my previous post hyperlink.