The PS Vita has a native "GTA San Andreas" Android port that runs flawlessly via the Moonlight or Homebrew stores. The PSP hardware (333MHz CPU, 64MB RAM) simply cannot handle the full PS2 San Andreas experience.
The UPD file for GTA: San Andreas on PSP is approximately 10-20 MB in size and contains a series of patches and updates that are applied to the game during installation. These patches might address issues such as: gta san andreas psp eboot pbp upd work
If you are attempting to run a fan-made San Andreas EBOOT and encountering errors: The PS Vita has a native "GTA San
The PBP file is encrypted and compressed using a proprietary algorithm, which helps to protect the game's intellectual property and reduce storage requirements. gta san andreas psp eboot pbp upd work