I am trying to use redsn0w on my iPhone 3g FW 3.1.3. Yes, I realize I could just use Jailbreakme.com, but I am wanting to experiment with Android and everything says you can't use Jailbreakme to JB or it'll cause problems. Ssoooo I have tried both redsn0w .9.4 and .9.5. I get to the point where it asks for the firmware. I select "iPhone1,2_3.1.3_7E18.ipsw". But both versions of redsn0w says "Unable to recognize specified IPSW". I know this copy of the FW is good as I've used it many times to restore my iPhone.