However, the story has a dark side. Using a cracked version was risky: The "Blink of Death":

It does not receive modern security patches or driver updates. Safe and Professional Alternatives

What of Sony Ericsson phone are you trying to service?

Fixing corrupted identification numbers (legalities vary by region).

What are you trying to accomplish (e.g., flashing firmware, removing a forgotten user lock, or network unlocking)?