Problem with wi-fi connection, maybe something broke?

Question

WiFi

A problem from the category "Either I'm stupid, or the skis don't go"
I have a laptop with Win10 installed on board, a Qualcomm Atheros QCA61x4A wi-fi adapter (well, there are external adapters)
About a week ago I stopped connecting to a wi-fi router "No Internet connection , protected". I fixed it by temporarily connecting an external usb adapter, it worked one evening, the next day the built-in adapter woke up and worked again, then it went off again and completely, but now the external adapter did not want to do anything either.
I had to go online somehow, I went to a parallel system in the form of Ubuntu, everything is fine there, the Internet works quietly, everything is fine. But somehow it is necessary to solve the problem in Windows, so I took it up.
I looked from the phone how and what, how they solve this problem, nothing really helped, what I did:
Reinstalled the adapter drivers I went through the
Windows utility for verification, it says "Windows cannot contact the device or resource (primary DNS server"
Cleaned dns via /flushdns Set
dns to automatic and to Google 8.8.8.8 Restarted
the dns service
Turned off / turned on the adapter itself, deleted and added it
It seems that everything was listed
A, and yet, the router and localhost do not ping and you can’t enter the router menu through the browser
In general, my system is extremely dirty, it hasn’t been reinstalled for 3-4 years, but at the moment it won’t be possible to reinstall it, and the system itself, as I understand it, is very tied to the hardware of the laptop (Korean lg laptop), so after reinstalling half from what is possible will not work
Please help in resolving the issue!