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!
Many modern "working" versions are actually high-definition texture mods for the PPSSPP emulator on PC or Android. These use the assets of Vice City Stories but skin them to look like Carl Johnson and Los Santos. How to Play San Andreas on Handhelds Today gta san andreas psp eboot pbp upd work
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. If you are looking for the "work" (updated/working)