Ps Vita Bios -

If you are looking for a psvita.bin file for an emulator, you do not need it. If you are looking for low-level hardware features on a real Vita, use Safe Mode (Recovery Menu). The "feature" of the PS Vita's boot system is primarily extreme security —it was designed to be unhackable (and ultimately was hacked via the PSP emulator, not the main BIOS).