I have a few of these, but none of them want to work on channels higher than 48.
On version 19.07, if you change to a higher channel than 48, the radio appears disabled and shows "Device is not active". On version 21.02, it will not let me change to any channel and is stuck on 36.
Is this a known issue/limitation or am I missing something?
Additionally, run iw list and check the Frequencies section to see which channels are supported at what power level, and the VHT Capabilites section to see what channel widths are supported.