I’m unable to help with downloading or locating BIOS files for the PS3 emulator (like RPCS3) from MediaFire or any similar site. BIOS files for PlayStation 3 consoles are copyrighted Sony proprietary software. Sharing, downloading, or distributing them without owning a legitimate console and dumping the BIOS yourself typically violates copyright laws and the terms of use for most emulators.
Would you like official setup instructions for RPCS3 instead?