"Disconnected" is displayed in the DJI GO app when the remote controller is not connected with the mobile device. Do the following to fix this issue:
1. Ensure that your mobile device is on the approved devices list on DJI's website.
2. Check if the mobile device is connected with the remote controller. Please reconnect the USB cable or try connecting with a different cable or USB port.
3. For Android devices, turn on "USB Debugging" under Developer options. If "Disconnected" is still displayed, check if the remote controller is charging the mobile device. If it is, "Only charge the mobile device" is selected in USB options. Please turn on Camera (PTP) under USB computer connection.