HT205370: About the security content of iOS 9.1
Learn about About the security content of iOS 9.1
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Q: iPhone 6 stuck in reboot mode after installing iOS 9.2
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Dec 14, 2015 1:03 AMby Ingo2711,Error 9 is pointing to a connection problem:
Errors: 2, 4, 6, 9, 1611, 9006.
Sometimes security software can stop your device from communicating with either the Apple update server or with your device.
Check your security software and settings to make sure that they aren't blocking a connection to the Apple servers.
If you still see the error message, check for USB connection issues.
copied from Get help with iOS update and restore errors - Apple Support
