Because BIOS files are copyrighted firmware, distributing them online is illegal in many jurisdictions. There are two primary legal methods to obtain your own: Mednafen PSX - wrong EU bios - Cores - Libretro Forums
Since you already searched Google, here is the safe path: playstation scph5502 v30 europe bios scph5502bin google
Distribution of scph5502.bin violates the Digital Millennium Copyright Act (DMCA) and similar laws worldwide. Emulation projects explicitly do not provide BIOS files to avoid legal liability. Because BIOS files are copyrighted firmware
The BIOS is the essential firmware for emulating the European PAL version of the original PlayStation. For many emulators, it is the "key" that unlocks high-fidelity gameplay for European titles. Performance & Compatibility playstation scph5502 v30 europe bios scph5502bin google