This worked for me. Just pay attention to the quote " not ”
Worked for me as well.
Posts by pypk
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Video playback on Raspbian is not as smooth as LibreELEC. So I would like to get 5GHz working on LE. But like the previous posters, 5GHz works in Raspbian but not LE. I agree that it must be a software problem. I hope the devs are looking into this.