iPad mini如何从ios9.3版本降级
【案例】ipad升级风险：2016年3月23日iPad mini从ios9.2.1升ios9.3变成了“砖头”
〖破解方法详解〗
1、重装系统。2016年3月25日用同步助手ver3.2.3.1 在刷机模式下安装助手下载的iPad2,7_9.2.1_13D15_Restore.ipsw重新刷回ios9.2.1系统。10分钟后助手提示：“刷机成功”，两天来已变成了“砖头”的iPad mini死而复生、重见天日。如果不保留用户资料的话，干净重装刷新系统只需5分钟就轻松搞定了。
〖刷机细节〗恢复模式是用来恢复iPhone的固件。DFU模式是用来刷机的，即升级或者降级固件。刷机前先用iTools3备份数据，干净安装刷机后再恢复备份。
2、系统优化。清理应用软件和系统垃圾，还是可以使用ios9.2.1系统。但为了适应iPad mini硬件，决定降级刷回原装系统。分析几个低版本与系统搭配情况，决定安装ios9.2.1
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ipad 不论是成了“白苹果”还是变“砖头”，干净刷新系统就好了[耶]