I bought a used iPhone 4S, it was jailbroken on 5.1.1. I want to restore it to stock. I tried just doing a restore through iTunes, and that kicked it into recovery mode. I didn't think to grab the SHSH blobs off of it first, so I'm not sure what to do now. I thought I'd be able to just flash the 5.1.1 IPSW, but if I recall, I think that needs to be signed as well - so not really sure what to do. Any help would be greatly appreciated.