# XII.	Parameters : advanced parameters (instrument)

To reach this page, slide up from any flight screen to make menus appear, then click « Parameters menu » button, then click « advanced parameters » button. 

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About the « reset to factory defaults » button:                                                                                                   The first step after a reset to factory defaults consists in calibrating the touchscreen. This is done by clicking on each of the 5 crosses.                                                                                                                           See a [video explaining a touchscreen reset](https://www.youtube.com/watch?v=TIZuv4vFBdQ).&#x20;

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Then comes the calibration of the magnetometer. This is done by turning the instrument in all possible directions (360° vertically and horizontally). Click anywhere on the screen once done.                           This step is important because it will highly influence the precision of the magnetometer.                     See a [video explaining the magnetometer reset](https://www.youtube.com/watch?v=Qb09M1eAaO8).&#x20;

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