So far it seems the Storm2 9520 has been getting a lot of love lately. Today we’ve been provided with OS! There is not an installer for these files. Perhaps someone will make one and post a mirror in the comments? 
Download Storm2 9520 OS >>

– This is an unofficial RIM software release. If you choose to
install, do so at your own risk! BB Leaks is not responsible for any
malfunctions or abnormalities that may occur.