It is important to manage expectations. The official Mortal Kombat 9 was released for PS3, Xbox 360, and PS Vita. The "PPSSPP ISO" versions available online are typically of Mortal Kombat: Unchained (the PSP version of MK: Deception). These mods replace textures and UI elements to mimic the look and feel of MK9. While not a 1:1 port, they offer the closest possible experience for PSP emulator users. Are you experiencing lag or audio stuttering ?
: Move the texture pack to the PSP/TEXTURES folder on your Android storage so the emulator can apply the MK9 skins. It is important to manage expectations
If you want the true Mortal Kombat 9 (Komplete Edition) experience with the original graphics and story mode, the Vita3K emulator is the better option. These mods replace textures and UI elements to
Place the downloaded .iso file and the separate folder into your device's PSP/TEXTURES directory. Option 2: Playing the Actual MK9 via Vita3K : Move the texture pack to the PSP/TEXTURES