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登录：https://beta.apple.com/zh-CN
登录自己的 Apple ID 账号，同意协议。
然后回到手机-设置-通用-软件更新-Beta版更新就可以看到该测试系统。
有朋友问更新了测试版系统，等正式版发布还可以更新吗？
答案是肯定的，到时候只要关闭 beta版更新即可。
