Im not 100% sure but I think there is somewhere a script on the router which downloads the driver, if you go to the home directory I often see a bin file I think this is the wireless driver/chipset.

However Im not sure where I saw this code (I could be confused with the firmware update code when I was searching for other things), I think its on the mwan3 main config, but it could also be in the glinet init script itself, perhaps somebody can confirm it better?