First copy the link https://oldcat.me/web/NOOTA9.mobileconfig   Then go to your browser (Safari) open , Click on GO, It will pop up after installation , Can be installed , If a password appears , This password is your lock screen password . After point installation , The word "restart" will appear , Click restart . After restart , The main interface will show a feedback Of APP, Open Settings - Universal - Software update , You will find that the current version is up to date . If it still shows IOS9.2.1 Of , Or you didn't restart the phone , Or you didn't delete the package , You can go to settings - Universal - The dosage - Manage storage space - Put it in 9.2.1 Just delete the installation package .

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