I'm having a trouble restoring my iPhone 4, currently, my iPhone 4 is in 5.0.1, I just want to restore it again to iOS 5.0.1, but whenever I try sn0wbreeze and create a custom firmware, and try to restore it, error 3194 will appear, then I'll try the HOST solution, it will go to error 1600, then try again iREB, it will go to error 21, and i tried using tinyumbrella, and use TSS, it will go to error 2500. help anyone