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So you dont like the beta-ness of iOS 10 and wanna go back to iOS 9 This way will make you keep everythig on your phone apart from your text messages.
1. D/L current iOS 9 IPSW for your device
2. Plug Device into Mac/PC
3.In iTunes go on your iPhone/iPad part now on Windows hold the "Shift" key and click on "Check For Update" . Mac - "Alt" - Check For Update.. Then pick the iOS 9 IPSW you D/led
4. It will start downgrading with all your settings as normal apart from texts..
psa NO you cant downgrade to an old version of iOS 9 eg a version thats Jailbroken.