Cudy wr1300 v3 openwrt 5g issue

I don't know why I can't turn on 5g in my cudy wr1300 openwrt. What are the settings to be set to access 5g internet in every 5g supported device home?

since you installed 22.03.0, have you upgraded to 23.05.3 ?

Yes, my brother helped me to do so. But he couldn’t help to return to the stoke firmware that I badly wanted.
However, your answer is yes. Now, I am on 23.05.03

You need to set country code for 5ghz and wait few minutes to clear channels for radar transmissions.
It works but not in an instant.