Independent creators (like Ys or Yogxsss) release updated ISO files or texture packs that add newer characters from the Boruto era, fresh stages, and modified ultimate jutsus.
If you're looking for about the actual game ( Ultimate Ninja Impact ), here's a short summary you might use as a basis for an article: Telecharger Naruto Shippuden Ultimate Ninja Impact 2 Psp
Since these aren't official releases, they don't come as a standard ISO from a store. Playing them usually requires: There Is an Ultimate Ninja Impact 2?!? Independent creators (like Ys or Yogxsss) release updated