@DarthReidar Don't see any new firmware on the website. If you need new firmware, maybe ask for it via their support chat/email? If there's one. Usually, in this case, you may get beta firmware. Use...

@Diorges This looks like a compatibility issue after the update. Like John mentioned you can try to manually fix that, will that work? If not, you should wait for TP reply. Maybe downgrade or next...

@Grauer Okay. I tried the Google translator. So, the PC should be on an untagged Ethernet port. Try to untag this port? Your setup looks okay.

@LanceSackless Don't know if you configured it right. Have you configured the IP group? Preference > IP Group. Specify your IP group and test again. The interface is the effective interface. Try to...

@Jackace Don't know why's that. What's the Omada version? 4.4.3? Software or hardware OC?

@Uniquimica Your Controller is not connected to the Internet? Check the LAN IP. Make sure no conflict. Make sure the router has Internet and OC is connected to the switch/router that has Internet.