. This file is provided for free by Sony and is the only legitimate and safe "system file" needed to initialize most emulators. RetroDECK Wiki Where to Download the Official Firmware

You should never download firmware or BIOS files from third-party "ROM" sites, as they often contain malware.

Downloading the BIOS is only half the battle. PS3 architecture (the Cell Processor) is notoriously difficult to emulate. To get "Better" results on Android:

Unlike other consoles that require a specific BIOS dump, the PS3 uses a System Firmware