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Sep 05
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First way

1. Run iTunes 8.2 then connect your iPhone 3G to your computer using iPhone’s USB Cable.
2. In Device lists, select your iPhone
3. Click “Check for Update” button in Summary pane
4. Click “Download and Install“. Do not disconnect your iPhone until the update has finished.
If iTunes automatically detect new update for your iPhone, you don’t need to do those steps.
Second way
If you have slow Internet connection or you need to install the firmware offline, you can following these steps below:
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