The Solo needs software to run it, and that software is called: SOSI (Solo Operating System Image).
Download the most recent SOSI from the page below, then transfer (flash) it onto the memory card before being inserted in the Solo.
All the code behind the Solo project is free and open.
If you would like to contribute, have a look at the github site, where
you will find three repositories:
solo sets up the Raspberry
Pi to host the audio recorder software
the documentation for this website is in the third repository