Or you might be trying to install an earlier version of i OS (downgrading).
To restore your device to the latest version of i OS, use recovery mode.
After deleting it, I would swipe to unlock my home screen but my phone would just shut off and restart.
Restoring it in i Tunes didn't work and errors would always pop up. I also tried downloading an ipsw file but that doesn't seem to work either.
Of all the errors that pop up every time I try to update, restore or (at times) even sync the i Phone, the notorious i Tunes error 3194 is the one I fear most.
Not that the error hasn't got a fix, but the fact that there are plenty of fixes for the error and that you'll have to try each one in a variety of combinations to fix the thing.
Of course, with Absinthe, it all changed and jailbreaking was once again fun and easy. May be you downloaded something and that has made the i Phone unstable – and you want to remove the jailbreak.
Restoring from backup makes sure your i Phone is “unjailbroken” but all the old apps, music, photos and contacts remain intact.
And when you're dealing with a jailbroken i Phone, it's going to be even worse.
This is the best way to go if you have a lot of data on your i Phone that is not on i Cloud or that you don't want to play around with.
To unjailbreak your i Phone or i Pad and backup all data: This will effectively remove all jailbreak data (and tweaks and jailbreak apps) but restore your device with all the other normal information. Restore your i Phone or i Pad as a new device This is the method I would prefer because of two reasons: 1) I don't have a lot of data so backing up or getting things from the i Cloud is easy and 2) this effectively makes my i Phone a totally fresh device leaving no trace of jailbreak or other tweaks.
In most cases, it’s because of a simple problem with the hosts file.
Here’s how to fix it: Again, if you’re lucky, this should work.