I have an iPhone 4, with shsh blobs w/ tiny umbrella that are 6.1.2 and also 5.1.1; currently the iPhone 4 has 6.1.3 on it and I cannot restore even with iTunes on my Mac. It says there was a problem with the request. As for trying to go the way of Redsn0w, I'm told many times that the plist data is missing. I've tried adding my own custom ipsw, combining ipsw 6.1.2 for iPhone 4 (CDMA) which i got online, along with my shsh build. I've been at this for hours and am willing to keep trying, or even going the 6.1.3 tethered route, if it exists but i cant find online anymore. I would rather go down to an untethered JB considering i'm on the road alot, but I do need to find a solution soon. Any help is greatly appreciated. I'm here all night answering any questions to further the progress.