Plz i want iOS 10.3.1 for iPhone 7 Plus how can reinstall this softwere

Hello I have iPhone 7 Plus iPhone 9,2  I’m running iOS 11.2 bt I want iOS 10.3.1 reinstall right now this software not signed so I can do this


iPhone 7 Plus, iOS 10.3.1, I need jailbreak
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Downgrading a device's iOS version isn't supported.

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