Technically, an official version of was never released for the PSP. While Rockstar Games released Liberty City Stories , Vice City Stories , and Chinatown Wars for the handheld, San Andreas was considered too massive for the PSP's hardware to handle natively.
When you see keywords like "eboot pbp" and "upd work," they typically refer to one of three things: gta san andreas psp eboot pbp upd work
If you are looking for the "work" (updated/working) version, your best bet is usually a modern port rather than an EBOOT: The Real GTA San Andreas for PSP! Technically, an official version of was never released
The PSP can natively play PlayStation 1 games converted into the EBOOT.PBP format. However, since San Andreas was a PS2-era title, there is no PS1 version to convert. Vice City Stories