Restoring iPhone does not download software file?
I have recently bought a brand new iPhone 5s running iOS 9.1. Normally when I've had to restore the software on previous iPhones (previously, another 5s and a 4s, all eventually running iOS 9.1), iTunes downloads a software file from Apple servers.
However, when I was restoring the new iPhone 5s today, iTunes did not download any software file, and the message at the top of iTunes had things that suggested that it had already been downloaded (even though it didn't) - like "verifying restore with Apple", "restoring software", "restoring firmware" etc.
My question is: does restoring the iPhone and reinstalling the software/firmware no longer require a download of the files required to do so? Does it come internally from somewhere?