After navigation to the folder MMM-PublicTransportBerlin, I used the commands:

sudo git pull
sudo npm install

to update the module, because of this API problem.

After rebooting my mirror, the browser automatically starts (as it should), but it shows nothing. Nothing is displayed and I don´t get any SSH connection? Any ideas what happend? (Just before I start to take the mirror of the wall and put the SD-Card into my Laptop.)