DJI have release a FW Update for the Phantom 4 Pro as follows
Aircraft Firmware Now : V 01.01.0203
Phantom 4 Pro Remote Controller Firmware : V 184.108.40.206
Phantom 4 Pro+ Remote Controller Firmware : V 220.127.116.11
Fixed an issue of some settings not being reset after resetting camera settings. Fixed color deviations when shooting at a high ISO value.
Fixed a rare issue where a black image is saved instead of a photo.
Fixed an occasional IMU calibration failure issue for the aircraft.
Reduced aircraft vibration during light-throttle take-off.
The DJI GO app does not support the Phantom 4 Pro. Please use the DJI GO 4 app.
Due to the size of the firmware, the use of a Micro SD card is recommended when upgrading the Phantom
4 Pro+ Remote Controller.
This update appears to resolve the issue of not being able to complete the new IMU calibration procedure DJI introduced with the Mavic Pro and now the Phantom 4, it seems this update has not resolved the HDMI Board not working on the standard GL300E controller though.
Order the Phantom 4 Pro Now from DJI