Manual reset
Press and hold the C1, C2, and shutter buttons simultaneously while the remote is off. Then, turn the remote on and the indicator should turn solid cyan.
Hard reset
Hold the three bars on the right side of DJI GO 4 for 10 seconds to refresh the firmware.
Reset from the splash screen
Touch the icon in the upper right corner of the white splash screen for more than five seconds to open reset and roll-back options.
If the remote controller has a red flashing LED and is beeping, it may need to be calibrated. To calibrate the controller, you can:
Connect the controller to an iPhone or iPad
Turn on the controller while the aircraft is off
Select the controller
Select Remote Control Calibration Unit
Select Calibrate
Select Start