The ultimate way to play using the PPSSPP emulator is by downloading the Mortal Kombat Unchained ISO file or utilizing highly customized fan mods , as an official PSP port of MK9 was never released by NetherRealm Studios.
Instead, the files found online under this name are actually built on top of Mortal Kombat: Unchained (the official PSP release) or compressed PlayStation Vita/PS3 assets adapted for Android emulators. Mortal Kombat 9 Ppsspp Iso Zip File Download For Android