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my interface is different some options are missing. I also loaded on the ROUTER AR750S ext. the opkg firmware of the RTL8822CE network card but nothing to do...

Unfortunately this time it is not so, I tried all the channels, the AC mode does not want to work. it is still very strange because I have the latest stable firmware openwrt OpenWrt 21.02.0 r16279-5cc0535800 / LuCI openwrt-21.02 branch git-21.231.26241-422c175. I don't understand why only this...

although from the description the AC mode is supported by the card. is there any terminal command to enable it?

... and after days of study and work FINALLY came the solution. As I imagined the problem was the ROUTER AR750s ext. In fact, in the settings of the 5ghz connection it was enough to change the "operating frequency" from AC to N to finally see the transmission of the packets. Finally my Debian...

I had already tried, currently it is set with the default values but there are unfortunately no results. I believe it is a problem of the router firewall even if the 2.4ghz mode works with the same firewall

Yes, as already mentioned, other devices connect in 5ghz mode without problems to the same Ar750s ext router. The only one that has problems is debian that can only connect in 2.4ghz mode

to me everything works, the only thing that does not work is DEBIAN in 5ghz mode. All the devices in my house are connected without any signal loss.

Yes the connection takes place even without DNS but no packet transmission takes place

I reinstalled IWD and the output is this :

as you can see the connection in 5ghz mode happens successfully but it is as if the DNS does not solve the names .

YES Thanks I had already restored everything.

1. I see both networks both 2.4 and 5ghz

No files found for iwd.service

I can not type it because after giving the command : sudo systemctl mask wpa_supplicant the service is masked I tried to enable the NetworkManager service but it does not restore

here is the output, as you see the frequencies are detected but there is no transmission in 5ghz of packets.

I followed the steps you have me suggested, after restarting the service "NetworkMangaer" is no longer running and I can no longer find any network. I gave the command : sudo systemctl restart iwd output: Failed to restart iwd.service: Unit iwd.service not found