Hi,
I have recently completed an update as my screen on the DJI app was telling me to. I updated the remote through the app and then the P3 using the SD card. Thought all was well until tried to start. Main screen on DJI app defaults to P4 and the controller goes nuts and flashes red. I can change back to P3 if I swith off the remote but when I switch back on it goes back to P4? I have a P3 adv?? Any advice?

Thanks

This seems very odd! How about re-linking the controller to your drone (see how to in the manual).