Download the file (typically named PSVUPDAT.PUP ).
You won't find the official version on the Play Store. You should download the latest Android release directly from the Vita3K GitHub official Vita3K website 2. Get the Firmware (The "BIOS") ps vita emulator for android bios download
Many older emulators required BIOS files, so users assume Vita3K does too. In reality, you only need: Download the file (typically named PSVUPDAT