Problem with factory reset of the ZED calibration

Last updated: October 23, 2026

All ZED cameras are individually calibrated in the factory, and the original calibration file of each unit is stored in the StereoLabs online database. Users can replace this calibration with a custom one (for example, obtained with the ZED Calibration tool or with an OpenCV-based procedure); a factory reset restores the original factory calibration.

When you perform a Factory Reset from the ZED Calibration tool, or when the ZED SDK does not find a local calibration file, the software downloads the original factory calibration file from the StereoLabs servers. If the download fails, the most common causes are a missing internet connection, or a proxy or firewall blocking the application.

Note: for cameras produced after May 2026 (except the ZED Mini), the factory calibration is also stored in the camera EEPROM, and ZED SDK v5.3 or newer reads it directly from the camera, without an internet connection.

Where the calibration file is stored

The calibration file is named after the serial number of the camera (SNxxxxx.conf) and is stored in:

  • Windows: C:\ProgramData\Stereolabs\settings\

  • Linux: /usr/local/zed/settings/

Step 1: Check your internet connection

Verify that the computer has a working internet connection and can reach calib.stereolabs.com. You can test it by opening https://calib.stereolabs.com/?SN=xxxxx in a browser (replace xxxxx with the serial number of your camera); the browser should download the SNxxxxx.conf file.

Step 2: Add a firewall exception

If the connection works in the browser but the ZED tools cannot download the file, your firewall is probably blocking the application. Add the ZED SDK tools (for example, ZED Explorer and ZED Calibration) to the list of allowed applications:

  1. Click Start and type firewall.

  2. Open Windows Defender Firewall.

  3. Click Allow an app or feature through Windows Defender Firewall.

  4. Click Change settings (administrator rights are required).

  5. Click Allow another app... and browse to the executable of the ZED tool, located by default in C:\Program Files (x86)\ZED SDK\tools\.

  6. Enable the app for both Private and Public networks.

As a quick test only, you can temporarily disable the firewall, perform the factory reset, and re-enable it immediately afterwards. We do not recommend leaving the firewall disabled.

If your network uses a proxy, make sure the system proxy settings allow the ZED tools to reach calib.stereolabs.com over HTTPS, or ask your network administrator to whitelist this domain.

Step 3: Download the calibration file manually

If the computer running the camera cannot access the internet (for example, offline systems, robots, or embedded devices), you can download the factory calibration file from another computer:

  1. Open https://calib.stereolabs.com/?SN=xxxxx (replace xxxxx with the serial number of your camera).

  2. Copy the downloaded SNxxxxx.conf file to the calibration folder of the target machine (see the paths above).

The ZED SDK automatically uses the local file without trying to download it again. For more information, see the Camera Calibration documentation.

Still having issues?

If the serial number is not recognized by the calibration server, or the problem persists after following the steps above, write to support@stereolabs.com with the serial number of your camera; we will send you the calibration file to manually reset your calibration data.