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For having fun with your Flight Computer, you have to put the right image on the SD-Card.
There are several ways for getting the necessary software for a working Flight Computer depending on what you want:
The easiest way to get a working software on your Flight Computer is to download a prebuild image for an SD-Card. The most recent image can be downloaded here:
A detailed guideline for writing the image file to a SD-Card will be here
To have a lot more control regarding the content of the image, like special maps, weather data or airspaces, you can setup you own build machine and build a customized image by yourself. Before you are going to begin with such a step, you should check if you meet the following requirements:
If you meet all the requirements you can get detailed instructions here