如何使Iphone进入DFU模式？
步骤如下：
1、下载iTunes 并进行安装,安装成功后打开，会出现此界面。
2、手机进入dfu模式。开机状态下，将手机与电脑连接。按住关机键2秒后同时按住关机键和
home键8~10秒最后保持按住home键15秒即可进入dfu模式。
3、进入DFU模式以后，此时iTunes会弹出如下窗口 点击确定按钮。
4、如果没有下载iphone固件包。请点击检查更新按钮，此时会自动从官网下载固件包并且进
行更新。如果有固件包在电脑中，请按住Shift同时点击恢复iphone按钮会弹出如下提示框。
5、点击恢复并更新按钮将会弹出如下提示框 。
6、点击恢复按钮将会进行全新的iphone系统安装 。
当您的苹果设备出现软件故障，无法正常启动，比如我们的设备开机密码忘记等问题可以通过DFU模式恢复解决。进入DFU模式步骤如下：
手机开机状态下将iPhone与电脑连接。（请用原装数据线或官方正规数据线）
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2.iTunes正确识别后关机。（长按电源键即可关机）
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3.请按住电源键，直到出现苹果LOGO。
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4.同时按住电源键和home键，持续直至logo消失。
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5.按住约4－5秒后放开电源键，继续按住home键不松直至iTunes检测到一台处于恢复模式的iPhone。
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6.这时iPhone会处于黑屏状态即为成功进入DFU模式。
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7.退出DFU模式，电源键和home键一起按强制重启即可。
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