让手机与电脑上iTunes连接,iTunes会自动识别手机的型号及其他信息。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/5fdf8db1cb1349541351a6a35d4e9258d0094aad?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
同时连续按住Home键和开关机键直到你的苹果手机进入DFU模式。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/ca1349540923dd544a3ce9afda09b3de9d8248ad?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
进入iOS设备DFU模式后继续按住Home键直到你的itunes弹出一个消息框,它检测到在恢复模式的iPhone,如下图所示:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/7af40ad162d9f2d3f7be6a28a2ec8a136227cc4e?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
检测到在恢复模式的iPhone,iPhone将黑屏,过一会就会重启。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/6f061d950a7b0208e766712669d9f2d3562cc84e?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
重启后你将看到你的iPhone则正处在恢复模式,点击恢复 iPhone按钮。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/a686c9177f3e6709febc0b3830c79f3df9dc55bc?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
现在我们找到刚开始下载的iOS6系统固件文件。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/0df431adcbef7609a56cd75825dda3cc7dd99e96?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
点击恢复按钮,这时候电脑将对你的苹果手机进行降级。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/94cad1c8a786c9174abf1cfec23d70cf3ac757bc?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
大约需要十几分钟的时间,完成之后我们点击OK即可。您的苹果手机已经成功降级至到以前的系统了。