If you have a hacked PSP and a UMD drive that still spins, searching for will lead you down a rabbit hole of forum threads from 2018.
To use the leaked eBoot PBP file, users will need to have a custom firmware (CFW) installed on their PSP. This allows them to run unsigned code, including the eBoot PBP file. Those with a CFW-enabled PSP can simply copy the file to their game folder and launch it using the PSP's built-in game launcher. gta san andreas psp eboot pbp exclusive