@JotaBE I forgot to introduce myself. Sorry. My name is Ilias Deligeorgis and I live in Greece, near Athens.

I managed to solve the problem too. It took me 2 hours this morning. While trying to connect to RE450 using my iPad (iPadOS 14.4) and the web interface with Safari I refreshed the page...

@JotaBE I have the same problem. I upgraded RE450 V3 to firmware re450v3_un-up-ver1-0-2-P1[20201203-rel80349] yesterday. Since then the only thing i can do is connect to TP-Link_Extender_2.4GHz or...