Press OktoPrep and install it. You'll get this message once it has been installed. Press the Home button when done.    

　　Step 3.

　　Launch iTunes and connect your iPhone. Since 1.1.3 firmware (or even newer) is available, you must ensure that you have already downloaded 1.1.2 firmware and saved it on your computer. This is an .ipsw file. Download 1.1.2 restore firmware here. Press the Shift button on your keyboard and click Update.

　　A file browser window will appear. Navigate to where your 1.1.2 firmware file is, select it and click Open.

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