okay, so now I'm stuck on entering backupmenu:

booting with keyboard out.
error appears:
"error: cp /usr/sbin/evkey /tmp/disk/usr/sbin/ Code: 1
cp: can't stat 'usr/sbin/evkey: No such file or directory...
Press any key to continue..."

which also appeared during pwnphone image installation, but back then, I just pressed any key and continued to backupmenu. This time hitting any key available simply won't do nothing. I also tried to reinstall / update backupmenu (which was successful), but that didn't change anything...