可能是没有满足升级要求，升级前最好关闭手机的查找我的ipad功能以及锁屏功能。
ipad更新系统的操作为：
（1）电脑登陆苹果官网下载安装后itunes软件打开。
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（2）用数据线把iPad与电脑连接。
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（3）在摘要界面，点击“检查更新”，按照itunes指示操作更新系统版本即可。
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