Hi Dronesky,
Yes - I can confirm the manual binding method works; I have personally done it a few times since I was having problems getting any mobile device to work with my controller. The instructions that I followed seem to match Osos tip.
1. Turn on RC Tx.
2. Press and hold C1 + C2 + record button (top LHS) simultaneously till you hear D-D-D.
3. Now press the top RHS scroll wheel and the RC will flash blue and DD-DD-DD-DD.
4. Press bind button on craft.
From:
DJI RC button combos - RC Groups
Take care!