Hi,
Starting this as a new thread…
On the RS250 and RS520 the wi-fi and BT are coming from a USB-A dongle.
The newer models now come with better BT and wi-fi built into the unit.
The one advantage of the dongle, is that you can replace the dongle w a newer model and a newer set of drivers. So that to get wi-fi 6 for example, you can find a wi-fi 6 dongle and a BT dongle as separates and then offer BT 5.4. This would mean upgrading the OS and loading the specific drivers.
The key issue is finding a supplier and the drivers then testing it out w the Android OS.
This would be a feature in that you could easily offer better wifi connections along w lossless BT codecs for a minimal effort. Sell w new units as well as offer an upgrade to existing owners.