The PAL BIOS will refuse to boot an NTSC game natively. You need a "Region Patcher" tool to change the game's region header or enable "BIOS region patching" in your emulator settings.
The internet is littered with corrupted or malicious versions of scph5502.bin . A bad dump might:
If the output matches b05def971d8ec59f346f2d9ac21fb42e , you have a perfect dump.