Using Redsn0w (0.9.14b2 or above), put your iPhone in DFU mode. You can download Redsn0w from here. During the restore process, iTunes verifies with Apple’s server if the device is allowed to install the specific version of firmware. To work around this issue, appended the following line 74.208.105.171 gs.apple.com to the host file…
DFU stands for Device Firmware Update. If you cannot restore using Recovery Mode you will want to use DFU Mode as your last resort. To put the iPhone into DFU mode so you can do an iTunes firmware restore follow these steps: Step One Open iTunes and connect the iPhone to your PC or Mac. …
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