Repair procedures: DJI Agras T20

Fit and remove the battery

Before and after every flight, and whenever you swap batteries.

1. Switch the drone off first. DJI's repair manuals say never to install or remove a battery while the drone is on.
2. Your user manual shows exactly how this model's battery latches. We haven't confirmed the mechanism for this model, so we won't guess at it.

Calibrate the compass

When the app asks, after travelling a long distance, or if the drone drifts or shows a compass error.

1. Go outdoors, well away from cars, buildings, metal structures and power lines. Take keys and other metal objects out of your pockets.
2. Start the compass calibration from your Agras remote controller's app — it prompts you when it's needed.
3. Hold the drone level and turn a full circle until the app says to stop.
4. Hold it vertically, nose pointing down, and turn a full circle again.
5. If it fails, move further from any metal and try again.

Follow the on-screen steps in the app.

Calibrate the IMU

When the app asks, after a hard landing, or if the drone won't fly level.

1. Work indoors on a flat, level surface, with the drone at room temperature.
2. Start the IMU calibration from your Agras remote controller's app — it prompts you when it's needed.
3. Place the drone in each position the app shows and keep it perfectly still until each step finishes.
4. Don't move or bump it during calibration.

Follow the on-screen steps in the app.

Update or reinstall firmware

When the app prompts an update, after an update fails, or if the drone misbehaves after one.

1. Update through the app whenever prompted. Update the drone, the controller and every battery — mismatched versions cause connection and battery errors.
2. Keep the battery charged and don't disconnect or power off mid-update.
3. If an update fails or the drone won't start afterwards, connect it to a computer with DJI Assistant 2 (Enterprise Series), open the firmware section, and reinstall.
4. Use a good-quality data cable — charge-only cables won't work.

The drone stays powered on and connected throughout — like the calibrations above, this is done with the drone switched on.

Clean the camera and sensors

If footage looks hazy, or the app reports a vision or obstacle-sensing error.

1. Switch the drone off.
2. Wipe the camera lens and every vision sensor gently with a clean microfibre cloth. Don't use solvents or press hard.
3. Check for dust in the sensor windows, and for smudges you can't see until you look at an angle.

Batteries

Before every flight and for storage.

1. Commercial and agricultural batteries have their own charging, temperature and storage limits — follow the battery manual for your aircraft rather than consumer-drone guidance.
2. Never use, charge or transport a swollen, leaking or damaged battery.