I need HELP here!!!!!!!!!, when I try to fly the dji phantom 2, the motors don’t start when i do the analog combination, they flash 3 times red, it seems that the transmitter doesn’t work but the gimbal control works. Ive tried to do all the updates, calibration BUT NOTHING WORKS !!!!! The weird thing is that the motors worked before I did an update. Please help me, I am desperate, please answer me as soon as possible!

Try to rebind the transmitter to the Phantom.

Anything shown on the WiFi device (iPhone, etc)?  "Warning.  You are in a no-fly zone. Takeoff prohibited."?

two main reasons cause this after update:
1. mode has switched from mode 2 to mode 1.
2. RC has lost its binding with the phantom. If your RC light is yellowish rather than bright green, you need to relink it to the phantom. Bear in mind the relink light on the bottom of the phantom is also the button, this is not very clear in the manual. The procedure is very simple and detailed in the manual on page 19 para 5.7 "linking the remote controller and receiver".. Hope this helps
cheers!
Rod