Problem with delta printer calibration

[azaelaguirre]

whyI have to calibrate my machine every time I restart it, the calibration data is not saved.

[Phaedrux]

Have you used these guides?

https://docs.duet3d.com/en/User_manual/Machine_configuration/Configuration_linear_delta
https://docs.duet3d.com/en/User_manual/Tuning/Delta_calibration

The calibration results can be saved by sending M500 and then can be loaded at startup by adding M501 to the end of config.g