the bridge instead of pushing Nemesis leads to a different final encounter and ensures Jill and Carlos escape via helicopter. how to install this Eboot on a specific firmware, or are you looking for a speedrun walkthrough for the PS1 version?
RE3 may have audio glitches on PSP. Use POPS loader (hold R on game boot) → change POPS version (e.g., 3.71, 5.00, 6.60). Resident Evil 3 Nemesis Eboot.pbp 12