Didn't work for me with The Social Network.
PS3 f/w is the last version that still has Install Other OS...
Here is another users suggestion,viewtopic.php?f=2&t=9059
as well, I found myself an older BluRay player that doesn't recognize Cinavia watermarking. If I come across a movie that is protected, I just remux to a bluray structure,then burn to disc and watch that disc on the BR player.