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No official version of Mortal Kombat X exists for the PSP , as the game was only officially released for Windows, PlayStation 4, Xbox One, iOS, and Android. Any "Mortal Kombat X PSP ISO" you find online is a fan-made mod, typically a re-skinned version of Mortal Kombat: Unchained (the only main MK title released for PSP). The "Highly Compressed" Mod Experience Fan-made mods for the PPSSPP emulator attempt to replicate the look of MKX on older hardware: Visuals & Interface mortal kombat x psp iso highly compressed work
These links frequently lead to sites with excessive ads or potentially harmful software. Hope this helps
Developers change textures and UI to make characters look like they are from MKX (e.g., adding Scorpion’s MKX skin). The "Highly Compressed" Mod Experience Fan-made mods for
That being said, here's a helpful post: