While McAfee notes that jailbreaking is generally legal in the U.S. for installing software, it does remove Apple's built-in security "sandboxes". For a legacy device that no longer receives official security updates anyway, many users find the trade-off worth it to regain control over their hardware. How to Get Started
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Resurrecting Legacy Hardware: A Look at the Phœnix Jailbreak While McAfee notes that jailbreaking is generally legal
For those looking to breathe new life into classic Apple hardware, Phœnix remains the gold standard for the iOS 9 era. phœnix jailbreak