For actual Mortal Kombat X mobile experience:
Mortal Kombat X was never officially released for the PSP.
The PSP’s last MK game was Mortal Kombat: Unchained (a port of MK Deception).
What people call “MKX PPSSPP” is usually one of these:
👉 No actual MKX port exists for PSP.
But if you want the closest experience (modded MK Unchained with MKX characters), follow below.
Safe websites often include:
Warning: Avoid any site that asks you to complete a survey, download a "downloader" application, or enter your phone number. Real PSP ISOs are simple ZIP or 7z files.