"Here’s the process for all us Windows users who want to upgrade to firmware 2.0. It involves WinPwn and a custom firmware. Check out my winpwn guide here.
Step 1: Use WinPWN 1.0 To PWN Your 1.1.4 iPhone. If you need WinPWN Get it:
RapidShare:
Step 2: Install BootNeuter (Available Via Installer).
Step 3: Run BootNeuter and have it Neuter your iphone
Step 4: Make sure your iTunes version is at 7.7
Step 5: Grab a pre-created IPSW Made with PWNAGE 2.0 Mac. If you dont have one made you can grab one here:
Step 6ut your phone into recovery or DFU mode(DFU GAVE ME ERROR ON RESTORE).
Step 7: In iTunes Shif+Click the Restore button and find your custom IPSW Firmware file.
Step 8: Wait for it to complete! ENJOY!"
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