Haven’t tried v30 yet, but on v29, I could only get the 2.4ghz dongle to work. I also tried using the hardkernel 5A module, and could never get it to connect to my 5ghz network. The module worked fine on other hardware and on different operating systems on the N2, so it seemed to be an issue with Batocera specifically.
Assuming the issue is still persistent on v30, I’d recommend picking up the 2.4ghz wifi dongle and using that for now.