Do not trust YouTube videos promising a "100% working BIOS pack" – those often contain malware or corrupted dumps from the PSTV. Stick to the official Vita3K firmware installer, dump your own console if you have one, and you will be playing Persona 4 Golden on your PC in no time.
If you are trying to emulate PS Vita games on your PC using the emulator, you need to understand the "BIOS" requirement. ps vita bios best
Always proceed with caution and ensure you understand the risks before making changes to your device's firmware. Do not trust YouTube videos promising a "100%