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If the drone will not connect to the controller, start by finding out which connection has failed: phone to controller or controller to drone. The message in the app may look similar, but replacing a USB cable will not resolve a lost radio pairing. Diagnose the issue on the ground and do not take off while there are warnings that have not been clarified.
This guide mainly applies to DJI drones with DJI Fly. Equipment that uses DJI GO 4 or other apps has different menus. Identify the full model of the drone and controller before following a sequence of button presses.
What appears on the screen?
| Symptom | First check |
|---|---|
| The app does not recognise the controller connected to the phone | Data cable, port and compatible app |
| The controller is recognised, but the aircraft appears disconnected | Power, compatibility and pairing |
| There is telemetry, but the image is black or frozen | Exact message, camera and video transmission |
| The drone appears connected, but will not let you take off | Safety warning, activation or restriction displayed |
Write down the warning exactly as it appears. A photo of the screen helps the support team more than simply saying “it does not work”. If you are indoors, keep the equipment on the ground, with the motors stopped, away from children and animals.
Check the connection to the phone
For controllers that depend on a phone, check that the cable is connected to the port specified in the manual. Remove any case that prevents the plug from being inserted fully. Try a compatible data cable in good condition: a cable that charges the phone may not allow communication.
Close the app, turn on the controller and open the app again. Accept the access requests needed for the USB connection when they are presented by the system. If you test another phone, first check that it is supported by the manufacturer. Change one variable at a time and record the result.
DJI separates this issue in its guide to errors between the controller and mobile device. If you use Android, also consult our tutorial on installing the official DJI Fly app. Avoid installing APKs shared on forums in an attempt to fix the connection.
Check power and compatibility
Check that the drone and controller are actually switched on, with enough charge for the intended procedure. Pressing the button once may only show the battery level. Use the start-up sequence in the manual and check the operating indicators.
Compare the exact names of the equipment with the official compatibility list. DJI RC and DJI RC 2 are different products, as are RC-N1 and RC-N2. Do not conclude that a controller is suitable just because it looks the same or was sold with another drone from the same brand.
Pair again safely
The official DJI linking guide identifies situations in which the equipment needs to be connected again, including certain repairs, replacements and firmware problems. On models covered by DJI Fly, the procedure involves the pairing option in the control settings and activating linking mode on the aircraft.
- Place the equipment close together in an unobstructed location, with the motors stopped.
- Open the app specified for the model and select the correct aircraft.
- Go to the pairing function specified in the manual.
- Activate the drone’s linking mode by following the buttons and timings specific to that model.
- Wait for confirmation and check the image, telemetry and warnings.
Do not mix sequences for different models. If the connection does not complete, save the warning and check the manufacturer’s guidance on firmware versions. An interrupted update calls for its own diagnosis; do not repeat installations indefinitely or switch off the equipment during an update in progress.
Account linking and controller linking are different
On a second-hand drone, a message about a linked account is not necessarily resolved by pairing the radio again. Before deleting data or repeatedly attempting activation, read the guide to transferring an account when buying a second-hand DJI. Do not use services that promise to bypass someone else’s account link.
When to stop and request a diagnosis
If there has been a crash, contact with water, a damaged port or repeated failure with compatible equipment, stop testing. Prepare the model, serial number (to be shared privately only), app and firmware versions, exact warning and list of cables or phones tested. Do not publish serial numbers or account documents on a forum.
After resolving the connection, review the pre-flight checklist. The image appearing on screen confirms only one part of the preparation.
Official sources consulted on 10 October 2026. Featured image is illustrative; this guide is not based on our own hands-on testing.
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