Hello everyone

I bought the used DJI Phantom 4. In the first flight everything was ok. In the second, however, difficulties arose. DJI Go did not show battery status, did not control camera, and dron did not load microSD card.  I tried several different microSD cards, but I did not change. Occasionally, the dron behaves normally - the camera is operated and the battery status is displayed. In most cases, I have problems.

I tried updating the firmware, but unfortunately I did not finish it once because the DJI Assistant application displayed an error.

I noticed that the LED blinks green at the camera in most of the time. Do you have any similar experience and can you advise me? I'm desperate
Thanks

Our apologies for the inconvenience. If it is convenient for you, can you provide a sample photo or short video showing the error? You can upload it by using google-drive or Dropbox and provide the link here. Click on "Reply" to make sure I can get a notification from your response. Thanks for your support.