Dji phantom 4 pro disconnected July 8, 2019 16 32 64 128 Dji phantom 4 pro aircraft disconnected Dji phantom 4 pro compass 1 disconnected Dji phantom 4 pro gimbal disconnected Dji phantom 4 pro cannot take off Dji phantom 4 pro battery signal error Dji phantom 4 downward vision sensor error Dji phantom 4 pro remote controller firmware update
