Hey guys, I bought my iPhone 4 about a month ago. It came with 4.2.8, but like an idiot, I upgraded to 4.2.10 when it asked me to. now I want to jailbreak and I know I can't with this 4.2.10. I have read up on downgrading, and I understand that one needs to have SHSH something or others on their computer. Of course, I never saved mine, but my question is, can I downgrade if i know someone who saved their SHSH to their computer via their iPhone 4? or would I have had to do it from my iPhone?