Hi. I apologize if I'm missing something, but I was wondering if someone could define exactly what SHSH blobs are? I backed mine up and recently downgraded from 4.0 back to 3.1.3 and everything went perfect. My question is, do I need to reinstall everything I had on Cydia prior to updating to 4.0 or is there someway to restore everything? Is that were the blobs come into play or do they just allow you to downgrade? Thanks in advance.