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Yes you can, but you will have to redo the jailbreak process.

When you update your iPhone is it wiped clean and reinstalls the new OS from factory defaults. This is also why it is so important to backup your data prior and why iTunes does it automatically.

Back up your iPhone before you update it. Then jailbreak it and then restore it with the previously backed up content.

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Q: Can you upgrade your iPhone 3.1.3 to 4.0 without losing an existing jailbreak?
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Does upgrading iPhone get rid of jailbreak?

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