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How do you downgrade iphone 4.2 to to 3.1.3?

Updated: 8/19/2019
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13y ago

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search the web for a custome ipsw of 3.1.3 download it then plug into iTunes and hold shift it will allow you to select your custom downloaded os. and your good. you can check with phonetraderonline.com they are cell phone experts and can help you with all your needs.

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13y ago
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Q: How do you downgrade iphone 4.2 to to 3.1.3?
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