got an email that piper has an update:
LATEST VERSION (ver2.0.2, 02/03/2017):
Do we have to reflash the sd card with it (and play all the levels again)
or is it possible to update an 1.0.6 to 2.0.2 (and how, just click on update in piper didn't do the trick)?
(perhaps taking a keyboard and apt-get ..., I would even try to dit /etc/apt/source.list entries if that help
Either way is ok, it would be helpfull if these little instruction were in the update post.