Hi there, Hubertus. Sorry for the inconvenience. Have you already tried these notes:• Before updating, ensure that the battery level of the device (remote controller or aircraft) is above 50%. • While updating, do not power off the aircraft or disconnect the USB cable. Otherwise, the update may fail. • While updating, the device may automatically reboot several times. When rebooting, it is normal for the remote controller to disconnect from the aircraft automatically. Do nothing before the update is completed to avoid affecting the normal updating process. We recommend using the app for updating. If the update fails, please refer to the method below and try again: 1. Power off and reboot the remote controller and aircraft. Try updating again. 2. If possible, use another mobile device and try again. For example, switch an iOS device to an Android device. 3. If the update using the app still fails, we recommend using DJI Assistant 2 for updating if you have a computer on hand. I hope it helps. If these have already been tried, don't hesitate to reach back so we can assist you further. Have a great day ahead.
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