Apple released iOS 11 for iPhone and iPad users on September 19, 2017. However, because of changes to iOS 11 compared with previous versions of iOS, Symantec Mobile Encryption 2.0.x will not work with iOS 11. To ensure that iOS 11 works with Symantec Mobile Encryption, you must first update to Symantec Mobile Encryption 2.1 before you upgrade to iOS 11.
Symantec has released Symantec Mobile Encryption for iOS 2.1.0; you can download the app from the iTunes App Store. Upgrade to Symantec Mobile Encryption 2.1.0, then upgrade to iOS 11.
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