Dankdronedownloader lists the following firmware for the Air 2 controller, but doesnt specify which controller
04.12.0056 but says this "
Non-Public DJI Firmware. Please do not distribute
It is NOT recomended to use this firmware for flying...
In the slot on the right side is a slide button that changes from remote to wifi, i had a play with it once but my phone was an old iphone 4 and it didnt work well, i guess newer phones will work better.