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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