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...
... 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