What is Code 40021?

Have you ever encountered error code 40021 while using your DJI drone?

Perhaps you’re curious to know what it means and how to fix the issue.

In this article, we will dive deep into the world of code 40021 and explore its significance on popular drone models like Mavic Air 2 and DJI Mini 2.

From troubleshooting tips to firmware updates, we’ll cover all the essential information you need to resolve this error and get your drone back in the air.

Plus, we’ll address some intriguing questions like whether DJI drones can be hacked and if they have the capability to track stolen devices.

Let’s unravel the mystery of code 40021 together.

What is Code 40021?

What is error code 40021?

What is Code 40021?

When it comes to understanding error codes, one that you might come across is code 40021. This error code is commonly associated with web applications and websites. It typically indicates that there is a problem with the server’s response to a client request.

The error code 40021 is specifically categorized as a “Bad Request” error. It suggests that the server was unable to process the request due to a client error, such as invalid data or incorrect syntax. This can occur when a user submits a form with missing or incorrectly formatted information.

If you encounter error code 40021, it is important to carefully review the request you made. Double-check that all required fields are filled out correctly and that there are no typos or special characters causing issues. Additionally, ensure that any submitted data is within the allowed limits set by the application.

To troubleshoot this error further, consider the following steps:

  1. Verify the URL and parameters in the request.
  2. Check for any missing or invalid headers.
  3. Ensure that the client and server are using the same version of the communication protocol.
  4. Inspect the server logs for more detailed error information.

By following these steps, you can effectively address the error code 40021 and resolve the issue that is hindering your request from being processed successfully.

What is error code 40021 on Mavic Air 2?

What is Code 40021?

Error code 40021 on the DJI Mavic Air 2 drone is a common issue that users may encounter during their flight operations. This error code typically indicates a problem with the vision system of the drone. The vision system is responsible for accurately detecting and avoiding obstacles in the drone’s flight path.

When error code 40021 occurs, it means that the vision system is unable to function properly, resulting in limited or no obstacle detection capabilities. This can be a significant concern as it poses a potential safety risk during flights, especially when flying in areas with obstacles such as trees or buildings.

To troubleshoot this error code, there are a few steps you can take:

  1. Ensure that the firmware of your Mavic Air 2 drone is up to date. DJI regularly releases firmware updates to address known issues and improve performance.
  2. Calibrate the vision sensors of your drone by using DJI’s official calibration process. This can help resolve any misalignment or calibration errors that might be causing the error code.

If the issue persists after following the above steps, it is advisable to contact DJI customer support for further assistance. They can provide specific guidance and help resolve the error code 40021 issue on your Mavic Air 2 drone.

What is error 40021 on DJI Mini 2?

What is Code 40021?

Error code 40021 is a common issue encountered by DJI Mini 2 drone users. This error typically occurs when there is a problem with the drone’s GPS signal or compass calibration. When the drone fails to establish a stable GPS connection or the compass data is inaccurate, it triggers error 40021.

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To troubleshoot error 40021 on your DJI Mini 2, follow these steps:

  1. Check GPS signal: Ensure that you are flying the drone in an open area away from tall buildings or other obstructions. Strong radio interference or signal obstruction can disrupt the GPS connection.
  2. Calibrate compass: Improper compass calibration can lead to inaccurate navigation data. Access the DJI Fly app, go to settings, and perform compass calibration before each flight to prevent error 40021.
  3. Verify firmware: Ensure that both the DJI Mini 2 drone and the remote controller have the latest firmware updates installed. Outdated firmware can cause various errors, including error 40021.

If the issue persists after completing these steps, contact DJI customer support for further assistance. They will provide you with specialized troubleshooting guidance tailored to your specific situation.

Understanding the nature of error 40021 on the DJI Mini 2 allows you to proactively address GPS and compass-related issues, ensuring a smooth and safe flight experience.

Will DJI fix my drone?

What is Code 40021?

If you are experiencing Code 40021 issue with your DJI drone, you may be wondering if DJI will fix it for you. The answer largely depends on the specific circumstances surrounding the error and the warranty status of your drone.

If your drone is still under warranty, DJI typically provides assistance and repairs for hardware and software issues, including Code 40021. You should contact DJI’s customer support and provide them with the necessary details and error codes for troubleshooting.

However, it’s important to note that DJI may not cover repairs or replacements if the damage or error is a result of unauthorized modifications, accidents, or user-inflicted issues. Make sure to review the terms and conditions of your warranty to understand what is covered.

If your warranty has expired, DJI offers a paid repair service for out-of-warranty drones. You can reach out to them for a quote and instructions on sending your drone in for evaluation and potential repairs.

  1. Check if your drone is still under warranty.
  2. Contact DJI’s customer support for assistance.
  3. Provide the necessary details and error codes.
  4. Review the terms and conditions of your warranty.
  5. If your warranty has expired, inquire about paid repair services.

Remember to have all the necessary information regarding your drone available when contacting DJI for support.

How do you reset a DJI?

What is Code 40021?

If you are experiencing issues with your DJI drone or camera gimbal, performing a reset may help resolve the problem. Here are the steps to reset your DJI:

  1. Power off the DJI device: Make sure the device is turned off. This can typically be done by pressing and holding the power button until it shuts down.
  2. Reset the remote controller: If you are using a remote controller, locate the reset button on the back or underside. Use a small, pointed object like a paperclip to press and hold the reset button for a few seconds. The remote controller will then restart.
  3. Reset the DJI drone: For drones like the DJI Phantom or Mavic series, locate the reset button on the aircraft. Press and hold the reset button until you see the lights on the drone flash rapidly.
  4. Calibrate the DJI gimbal: If you are encountering issues with the gimbal, perform a gimbal calibration. Access the DJI app on your mobile device, go to the settings menu, and select the gimbal calibration option. Follow the on-screen instructions to complete the calibration process.
  5. Update firmware: Ensure that your DJI device is running the latest firmware. Check the DJI website for any available updates and follow the instructions provided to update the firmware.
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By following these steps, you can reset your DJI device and potentially resolve any issues that may be occurring. If the problem persists, it is recommended to contact DJI customer support for further assistance.

How do I update my Mavic Air 2 firmware?

What is Code 40021?

If you are wondering how to update the firmware on your Mavic Air 2 drone, follow these steps:

  1. Ensure that your drone’s battery is fully charged. This is crucial to avoid any interruptions during the update process.
  2. Connect your mobile device to the remote controller using the appropriate cable.
  3. Launch the DJI Fly app on your mobile device.
  4. In the app, tap on the Mavic Air 2 icon to access the drone’s settings.
  5. Scroll down and select the “Firmware Update” option.
  6. If an update is available, the app will display the release notes and prompt you to download and install it.
  7. Ensure a stable internet connection and tap on the “Download Now” button.
  8. Wait for the download to complete, and then tap on “Start Update” to initiate the installation process.
  9. During the update, it is essential to keep the drone and the remote controller powered on and connected.
  10. Once the update is finished, restart your Mavic Air 2 and recalibrate the compass if prompted by the app.

Updating your Mavic Air 2 firmware regularly ensures that you have the latest features, bug fixes, and performance improvements. By staying up-to-date, you can enhance both the safety and enjoyment of your drone flights.

How do I unlock my Mavic Air 2 authorization zone?

What is Code 40021?

If you’re wondering how to unlock your Mavic Air 2 authorization zone, here’s a step-by-step guide to help you:

  1. Identify the authorization zone: Determine the specific area where your flight might be restricted due to safety or security concerns. These zones are usually marked as Code 40021 in the DJI Fly app.
  2. Access DJI Fly app: Launch the DJI Fly app on your compatible mobile device.
  3. Go to Unlocking: Navigate to the Unlocking section within the app’s menu.
  4. Select Authorization Zone: Choose the authorization zone that you wish to unlock. In this case, look for Code 40021.
  5. Verify Account: Make sure you have a verified DJI account to proceed with the unlocking process.
  6. Submit Request: Provide essential details, such as the purpose of your flight and the duration you require access to the zone.
  7. Obtain Approval: Wait for DJI’s approval, which often arrives via email or through the DJI Fly app notifications.
  8. Complete Unlocking: Once you receive authorization, follow the instructions provided by DJI to unlock your Mavic Air 2 within the specified zone.

Remember to stay updated with any changes in local regulations and restrictions. It’s crucial to ensure safe and responsible flight operations at all times.

Can DJI drone be hacked?

What is Code 40021?

One concern that often arises when discussing drones is the potential for hacking. Can DJI drones be hacked? Let’s dive into the topic to find out.

Firstly, it’s important to understand that no digital system is entirely immune to hacking, including drones. However, DJI, a leading drone manufacturer, takes cybersecurity seriously and employs comprehensive measures to protect their drones and user data.

DJI continually releases firmware updates that address any potential vulnerabilities. It is crucial to keep your drone’s software up to date to ensure you have the latest security patches and improvements.

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To further enhance security, DJI utilizes an aircraft separation technology that isolates your drone from external networks while flying. This helps protect your drone from possible hacking attempts.

If you are concerned about your drone’s security, here are some best practices to follow:

  1. Only download apps and software updates from official DJI sources.
  2. Enable two-factor authentication for your DJI account to add an extra layer of security.
  3. Do not connect your drone to unsecured or unknown Wi-Fi networks.

Remember, while the possibility of a DJI drone being hacked exists, following these precautions significantly reduces the risks. Stay vigilant and prioritize the security of your drone and personal data.

Can DJI track a stolen drone?

What is Code 40021?

One common concern among drone owners is the ability to track and recover a stolen drone. Many have wondered if DJI, the renowned drone manufacturer, has developed any means to locate stolen devices. However, it is crucial to note that DJI’s drones do not come with built-in theft tracking systems.

Although DJI drones lack this feature, there are alternative methods available to increase the chances of recovering a stolen drone:

  1. 1. Serial Number Registration: Registering your drone’s serial number can help authorities identify your drone if it is retrieved or seized.
  2. 2. GPS Trackers: Aftermarket GPS tracking devices can be attached to your drone, allowing you to monitor its location remotely.
  3. 3. Drone Recovery Services: Several companies offer specialized services that help trace and recover stolen drones. They use various methods, including online communities and databases, to increase the chances of locating a stolen drone.

Moreover, as a preventive measure, it is recommended to:

  • 1. Label Your Drone: Clearly label your drone with your contact information to increase the possibility of someone returning it.
  • 2. Secure Your Drone: Utilize secure storage options, such as locked cases or cabinets, to deter theft.

While DJI does not have a direct method to track stolen drones, following these recommended steps can significantly improve the chances of recovery. It is vital for drone owners to remain proactive and employ additional safety measures to safeguard their valuable devices.


After exploring various aspects related to code 40021 in relation to DJI drones, we’ve gained valuable insights.

We’ve learned that code 40021 is an error occurring on both the Mavic Air 2 and DJI Mini 2 drones.

While DJI might fix your drone if affected, it’s crucial to understand how to reset a DJI and update firmware correctly.

Additionally, we have discussed unlocking the authorization zone for the Mavic Air 2 and the possibility of hacking and tracking stolen DJI drones.

As a final word, this comprehensive exploration of code 40021 equips you with key takeaways to navigate and troubleshoot the issue effectively.

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