Open your emulator, navigate to File > Install Firmware , and select your downloaded .PUP files.
However, you can legally obtain the firmware files yourself. ps vita bios best
To get the highest compatibility (the "best BIOS" experience), follow this checklist: Open your emulator, navigate to File > Install
To achieve the highest compatibility and stability, you should use the official files rather than searching for third-party "BIOS packs." Open your emulator