Feeling like an idiot here. I'm JB on 5.1.2 on my 4s. I'm updating it (removing jailbreak) to sell the phone. When I connect to iTunes and click restore, it prompts me for a location for the ipsw file. I don't have that. Do I need to download one or try to do the update straight from the phone (6.1.3 is currently showing available). Then go to iOS 7?