There is no official Mortal Kombat 9 (2011) release for the PlayStation Portable (PSP). The game was released on PlayStation 3, Xbox 360, and PC, with its only official handheld port appearing on the PlayStation Vita in 2012.
Mortal Kombat (2011), commonly known as MK9, was built for much more powerful hardware than the original PSP could handle. Official Platforms: PlayStation 3, Xbox 360, PC (Windows), and PlayStation Vita The PS Vita Port: mortal kombat 9 psp iso download top
If you want the authentic Mortal Kombat 9 gameplay—complete with the X-Ray moves and the 2D fighting plane—you have better options than searching for a non-existent PSP ISO: There is no official Mortal Kombat 9 (2011)
Modded Files: Many "MK9 for PSP" downloads are actually Mortal Kombat: Unchained with custom textures or menu skins to make it look like MK9. Top Mortal Kombat Games Actually Available for PSP Nostalgia – PSP fans want modern MK gameplay on the go