In another post, I was testing COMFAST CF-953AX, which is an USB WiFi with 6GHz WiFi 6E support.
Using it in NanoPi R2S/R4S, and Raspberry Pi 4B, using 23.05.2 latest stable, all showing me only 2.4GHz/5GHz band, I thought it might be hostapd issue so I wasn't too care about that. Until today I plugged it to any older Raspberry Pi 3 with the same 23.05.2 firmware, 6GHz option shows up and usable!! I ran iw list command in all routers and really only the Pi3 is showing 6GHz channel available. They are all using same release, same kmod-mt7921u, why there can be a difference?
That's another question, on Pi 3 it has 6GHz that's why I am asking that, but on Pi 4, and NanoPi there is no 6GHz that's why I am asking about the inconsistency.
I would try comparing the installed packages and the wireless config file. If there is a difference, my guess would be that it is likely to be found somewhere there.
You can also try deleting the wireless config file and reboot, but leave the stick attached. (that will regen the file with defaults based on the found HW.
the r4s does not have built-in wifi, right? so at least that one should have nothing by default, to conflict with your post flash wifi custom stick installation. So missing packages or a wireless config issue seems likely (theoretically, on Raspberries you never know, what kind of evil influence the Broadcom driver brings to the table)
Yes, R4S has no WiFi by default, however Raspberry Pi 3 & 4 are quite similar device, and their packages (regarding connectivity are the same), so I am kind of curious why there is difference.