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My iPhone 4 running on 4.2.1 and I was wondering if I could restore the phone to the same firmware by dowloading the original firmware and holding SHIFT in iTunes and clicking restore???

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up vote 1 down vote accepted

You may restore your iPhone to 4.2.1, but you need the SHSHs for your device as Apple servers only allow 4.3 firmware at the moment, I think.

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