This article is explaining how is the process of iPhone firmware verification while restoring through iTunes.
Understanding the iTunes verification server
By iGuru – Version 1.1 – 26th September 2009
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Dedicated to: Jay Freeman (Saurik), semaphore and Apple.
With the introduction of the iPhone 3G[S] (3GS, not 3G) Apple introduced a new feature – restore verification.
This process relies on specific data that is unique to each phone, including the iPhone 3G[S]‚Äô ECID, a new ID that is unique to every phone produced.
How the verification process works:
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