1. Open balenaEtcher 
2. Choose your downloaded HOOBS IMG-File
3. Choose your mounted micro SDCard
4. Flash it onto your SD Card (Process will take 2-3 Minutes)

FOR WINDOWS USERS:
Sometimes, this box might pop up after Flashing is Completed.
It is because the microSD card is no longer recognized by the computer (is it correct?).
Don’t worry about it and simply click Cancel don’t press Format