RC/RC2/RC PRO FCC MODE HACK
Although this is not yet “the holy grail” of installing the drone-tweaks app directly on the RC, it is a very nice step forward for people using the DJI RC, RC2 or RC Pro.
So, in a nutshell, the same drone-tweaks app used with the standard controllers can also be used to switch the smart controllers into FCC mode, following a simple procedure. Basically, all you need to do is to activate quick transfer from the FCC app while the RC/RC2/RC Pro is connected to the drone and the drone has already acquired GPS and updated the home point and this will switch the drone and controller into FCC mode.
This has been tested on DJI RC, DJI RC2 and DJI RC Pro, all on latest firmwares. Please keep in mind that, given the nature of this method, where the phone doesn’t remain connected to the controller, I would recommend exercising extra care when updating firmware on both drone and controller.
Again, this is done with the same drone-tweaks FCC app you guys already know so, if you already have a drone-tweaks license, you don’t need to purchase anything else to get this done.
There are two small downsides to this:
• the procedure, although short (~15s), must be done before each flight
• if the connection between drone and RC is completely lost (the moment when the screen turns black&white and there is no video or telemetry coming from the drone), the mode will switch back to CE.
I created two videos, for iOS and Android, showing how this is done. Have fun 
iOS:
Android: