Once you have your scph70004.bin file, it is typically placed in the /bios/ folder of your emulator. In the settings menu, you would select the entry to match this specific dump.
The SCPH-70004 was famous (and sometimes infamous) for its "MechaCon" (Mechanism Controller) chip. Early v12 units had a bug that could occasionally burn out the laser. While the BIOS doesn't fix the physical hardware risk, researchers use the v12 BIOS dump to study how Sony attempted to manage power delivery via firmware. scph70004biosv12eur200bin exclusive
Consequently, clean, verified dumps of scph70004biosv12eur200.bin are rarely uploaded to public No-Intro or Redump sets. They are traded privately—hence, Once you have your scph70004