There is no system of precedence for rulings of lower courts in Germany, technically not even for higher courts (albeit there de facto is). That’s something you could find in the U.S. though.
The lower court fucked up and it got overruled. The only thing Sony could have done would have been to bring similar cases to the same lower level court again and again and hope they make the same wrong decision over and over. That’s about the closest thing to precedence they could have relied on. It probably would have worked for Sony though.
Or… A iKeyboard
I will see myself out