Apple's support page for specific errors on i Tunes isn't all that helpful.
For starters, Apple isn't all that interested in people downgrading their i OS firmware.
One of those things is i Tunes error 3194 (i Phone error 3194). It is the most fundamental software, the thing which allows your computer, your phone, to do its job.So keep applying one by one might one of them tip works for you, definitely.Updated (July 1, 2016): Make sure your i Tunes updated with latest version on Mac or PC.So naturally, all the signing is already done with so if you're trying to downgrade to i OS 7.x an upgrade to i OS 8, you're going to have a bad time (unless you're lucky and you downgraded within the short time window where Apple still signs).And when you're dealing with a jailbroken i Phone, it's going to be even worse.Things have developed and today, rather than hardware, it is very often the software which lets us down. Android is an OS, Windows is an OS, and those of us lucky enough to have i Phones, are users of i OS. Partly because it is probably THE most reliable OS of them all.