Since you already searched Google, here is the safe path:
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 playstation scph5502 v30 europe bios scph5502bin google
The European BIOS forces 50Hz output (20% slower than NTSC's 60Hz). However, this is where the SCPH-5502 gets interesting. Unlike later PAL optimizations, many early PAL games ran in "border-box" (black bars top and bottom) but at the correct speed. The BIOS handles the synchronization. Since you already searched Google, here is the
The file scph5502.bin is a of the ROM chip from a real SCPH-5502 console motherboard. The "v30" in your keyword string refers to the fact that this version of the BIOS shows "V3.0" in the system's CD player menu if you press "Triangle" on boot. Unlike later PAL optimizations, many early PAL games
If you're looking for more information on the PlayStation SCPH-5502 V30 Europe console or the SCPH-5502BIN file, here are some additional resources:
Unlike earlier BIOS versions (v1.x, v2.x), the v3.0 BIOS present in the SCPH-5502 series is highly sought after for emulation and preservation for several reasons:
The BIOS is copyrighted firmware owned by Sony Interactive Entertainment. Dumping your own BIOS from your personal PlayStation console is legal in most jurisdictions (Fair Use / Backup rights). However, downloading the scph5502.bin file from a random website is copyright infringement.