Can you update an iPhone 4 on iOS 6.1.2 to 7.0.6 using an IPSW file? So I have an iPhone 4 that's been happily jailbroken on iOS 6.1.2 for a while now, but I want to upgrade to 7.0.6. I downloaded the IPSW for it and shift-clicked on update, but I get the error 'The iPhone could not be restored. An unknown error occurred (3194)'. I read up on it and proceeded to correct my hosts and firewalls, but nothing seems to work.

So, the question is: Is what I'm trying to do even possible, or should I just settle for iOS 7.1 with no jailbreak? Also, is there any way to update without using iTunes, because it seems to be the only thing causing the problem?
iOS 7.0.6 is no longer being code signed by Apple. Only the most recent version of iOS is code signed by Apple, and the iPhone will not accept a version of iOS that has not been code signed. So essentially, this is impossible.