I wanted to update my WLAN Pi to the latest version so I downloaded version 2.0.1 and Belena Etcher. But I had “Flash Failed” two or three times so I searched and found out that you could open a console with CTRL + SHIFT + I in Belena to get more information what’s happening. And there I found out that my flash failed because it couldn’t unmount the SD card, and that is probably because my user isn’t admin on my work computer so it was probably not allowed to do that operation without administrator privileges.
So I tested the SD card in my WLAN Pi and it worked and started up version 2.0.1.