I believe Cydia has a signature for my fone but I am not sure (1.) how to insert AND save "184.108.40.206 gs.apple.com" in the hosts file on my new Snow Leopard IMac and (2.) even if successful how to get Cydia to restore to 3.1.2 from the 3.1.3 now on my fone. I mistakenly used ITunes to restore my jailbroken and cracked 3GS, and now am up to 3.1.3, with an un-jailbroken and locked paperweight, instead of my original 3.1.2 3GS!!!