This is often caused by a network spike. Restart the software and the drone, then try the "Refresh" firmware option.
Open the DJI Assistant 2 software and log in with your DJI account. dji phantom 4 assistant software download
While the DJI GO 4 mobile app is used for daily flying, the Assistant 2 software provides professional-grade tools for your computer: This is often caused by a network spike
Try a different USB port or cable. Ensure you are using a data-transfer cable . dji phantom 4 assistant software download
Remove the propellers for safety, then power on the drone.
Download and analyze flight logs for performance troubleshooting.