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iPhone 3.0 requires you to install iTunes 8.2.
Installing iPhone 3.0 on the iPhone
1 Make sure to have downloaded the iPhone 3.0 firmware that relates to your iPhone (2G or 3G ).
2 Extract the firmware IPSW to a folder.
3 Connect the iPhone to yourcomputer.
4 Get the UDID registered on the iPhone Developer program. (How to?)
5 Open iTunes and click Restore while holding the Shift key (for Windows) or Option key (forMac).
6 Locate or browse to the firmware IPSW.
7 Wait for iTunes to unpackage and install the firmware.
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