I would highly recommend you use Pwnage Tool for your hacking needs. Much safer and much more streamlined. Redsn0w is the quick way to do it, but the Dev team recommends you use Pwnage instead.
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I had the same problem "unable to recognize specified ipsw" , but thank God now it's solved. i searched for 4 days but thank god finally i have founded the correct solution. I can't post that solution here because of copying content is illegal act so i can give link. Click Here for solution for unable to recognize specified ipsw