How to setup wifi on raspberry 4 raspbian?

Question

Raspberry Pi

I bought a raspberry 4, uploaded raspbian to it, set up a graph interface and connected the cable. Through the remote desktop, she calmly controlled it. But an adapter arrived and it became necessary to transfer it to another table with its own monitor, but there was no cable for the Internet. It seems to set up wifi, but it does not work.
At first, although I edited the wpa_supplicant.conf file, it did not work for me at all. I tried to connect to wifi from gui - it gave an error that "can't disconnect". Cleaned up the file and re-filled like connected to the network.
It does not connect to the router I need (to which it is connected via cable) at all (d-link), but it seems to be connected to mgts'ovsky (zte).

However, even in it, by the ip that I gave out to raspberries, I can’t connect either via ssh or to the desktop.

In the gui, the list of networks constantly appears and disappears (perhaps this is important and it should not be so, now it does not detect it at all, despite the fact that it is connected).

Answer 1

For raspberry 4 on off raspbian, you need to enable b / g / n mixed 2.4ghz in the router (apparently not N in it because it does not work).
And 5Ghz is not supported by wasps in Russia.

Answer 2

1. In raspi-config - Change wireless country selected?
2. What is the body on the raspberry? (I have an aluminum one so it shields and wifi with bluetooth does not catch well)