Connect the iPhone to the computer without having iTunes or iTunes Helper running. Hold down the Sleep and Home buttons on the iPhone for roughly 25 seconds until the connect to iTunes screen appears. Open iTunes. Hold down Option (shift if you're in Windows) and click restore. Choose the file you'd like to use to restore (in this case, 1.1.1). Let it run its course.
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↑ ↑ ↓ ↓ ← → ← → B A B A [select] [start]
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