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福利！苹果允许老款iPhone系统降级 附教程
source link: https://news.cnblogs.com/n/587025/
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下载地址：https://ipsw.me/#让人没有想到的是，苹果居然偷偷开启了降级通道，如果你现在的iOS版本不满意，完全可以退回原来的版本。经过实际查询后你可以清楚的看到，iPhone5、5S、6、6S、7系列机型的老版本固件，苹果都已经默认开启了降级通道，所以如...
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