I have an iPhone 3GS, jailbroken and unlocked using Pwnage Tool and UltraSn0w, on 4.3.3. I want to sell it and erase everything, but my understanding is reseting it using the "Erase All Content and Settings" would cause me to lose my JB/unlock which is no good since it's useless where I live (Indonesia) if it's locked to AT&T. Recently I tried to update to 5.0.1 using Pwnage Tool and keep the unlock but it failed, I believe due to the fact that Apple is no longer signing 5.0.1. Is there a way I could just restore to 4.3.3 (custom IPSW, of course) without Apple signing the certificate? I'm a little confused how the certificate signing thing works, but I think the question might be "Did you save your shsh blobs" and I think the answer is yes. I just don't really understand that and know how to use them. I've always used Tiny Umbrella, Pwnage Tool, and UltraSn0w when JB/Unlocking it. Thanks for your help!