@woozle Thanks. I updated it to TL-WA850RE(EU)_V7_1.0.13 Build 231115 and it helped. Thank you very much

@woozle Why extender can't be updated by itself with official version? How should I check current version of firmware of the extender?

@woozle There is no button 'Update' for extender in 'Tether' application.

@Ahmed_Taha I have the same problem and I haven't fix it yet. As soon as I enable extender I can't connect to the main router network from my laptop, I have an error 'Wi-fi doesn't get a valid IP...