And when you’re dealing with a jailbroken iPhone, it’s going to be even worse. So naturally, all the signing is already done with so if you’re trying to downgrade to iOS 6.1.3 or lesser after an upgrade to iOS 7, you’re going to have a bad time. For starters, Apple isn’t all that interested in people downgrading their iOS firmware. Apple’s support page for specific errors on iTunes isn’t all that helpful.
