Sony never authorized BIOS distribution. Dumping your own BIOS from a physical SCPH-70012 is the only legal path. But (TOP) adds a wrinkle: if you own a 70012, you might have a TOP or non-TOP version depending on (early vs late 2005).
If you need further analysis (e.g., disassembly, specific offsets, or comparison with other BIOS versions), provide additional context for "top."