你也许会遇到一个小问题使得你的iPhone运行速度明显变慢或死机，然后你想把iPhone恢复至之前的备份。你需要恢复出厂设置来清除iPhone里所有的数据和设置，然后选择用iCloud或者iTunes的备份来恢复你的iPhone。这篇文章将会教你这两种方法。
步骤
方法 1 的 2:
用iTunes恢复备份
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1
用USB将iPhone和电脑连接。
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2
在iTunes设备列表中选择iPhone。
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3
右键点击iPhone设备名称，选择“从备份中恢复”。选择你要恢复的备份。
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4
按提示操作。
方法 2 的 2:
用iCloud备份恢复
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1
用iCloud或者iTunes来备份你的iPhone。这是个防范措施，以免在重新设置时出现任何异常情况。
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2
在iPhone上打开设置。
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3
点击“常规”，然后向下滑动页面点击“重新设置”。
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4
选择“清除所有内容及设置”。
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5
当你的iPhone重新启动后，系统会提示输入你的AppleID，并从恢复之前的备份。点击“从iCloud恢复”，选择你想要恢复的备份。