@lizh @JerryZhao You might be happy to know that this issue could be (at least partially) solved by using kernel 5.4. I don’t know if flashing a kernel changes the regulatory domain, but if it doesn’t, then at least a few of those channels become available. I don’t know if it’s all the channels I expect because I had it set up on 80MHz channels.
I cannot investigate further because I then flashed the beta firmware as well and I don’t have an ethernet adapter with me.