Hey qian - Currently there isn’t an official public IMU calibration tutorial available yet.
It is planned/in progress on our side, and IMU calibration support is expected to be part of the upcoming DepthAI release (should be released soon). Once the API/workflow is finalized, we should be able to provide a proper script/guide for users.
For now, if your device is missing IMU calibration data and this blocks VIO/SLAM, please contact Luxonis support with your device details/serial number.
Thank for the wait.
Oskar