Always back up your original USRDIR files before overwriting them. Modding on PS3 can lead to data corruption if the file sizes aren't handled correctly by the system's cache.
The is a labor of love that deserves to be played. The vanilla version on PS3 is broken, but by following the slot override, stage deletion, audio rebuild, and param.sfo edit detailed above, you can transform Naruto Shippuden: Ultimate Ninja Storm Revolution into a surprisingly functional Boruto game.
: Back up and delete existing NSUNSR save data and game data to prevent conflicts.