, you cannot simply download an official "ROM" from the PlayStation Store, as it was never officially released for the platform. Instead, you must use a that adapts the mobile (Android) version of the game to run on the Vita's hardware. The PS Vita Port vs. Official Releases
You provide your own legal copy of the Android version of GTA: San Andreas (usually version 1.08). The homebrew application then extracts the textures, models, and audio from those Android files and packages them into a Vita-friendly installation. gta sa ps vita rom