It is signed with a unique id (ECID) that only your device has. See, the firmware is now signed for the below devices. The way they stop you is basically by a simple response that iTunes receives when you try to restore the firmware of your choosing. Once you ‘upgrade’ they don’t let you downgrade. ![]() ![]() ![]() When you try to restore an older firmware on the devices listed below, Apple won’t let you do that.
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