HT206225: About the security content of iOS 9.3.1
Learn about About the security content of iOS 9.3.1
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Apr 17, 2016 6:10 PM in response to donfrombelgradeby ChrisJ4203,And why won't it let you upgrade? What happens when you try? Are you trying to upgrade via OTA on the device, or are you connected to iTunes and the computer?