推荐回答（1个）
方法/步骤
1
降级方法一：通过同步助手一键降级（速度快，操作简单，推荐使用）
降级前准备：刷机前请做好数据备份，以防重要数据丢失的情况发生。运行同步助手，进入【更多功能】—【备份还原】可一键备份微信记录、联系人、备忘录，相机胶卷、应用程序的设置等信息。
打开同步助手，在主页面上点击【刷机越狱】，进入刷机界面
同步助手会自动匹配可刷机的固件iOS9.3.5，点选该固件，勾选“保留用户资料刷机”和“连接成功自动激活设备”，点击【开始刷机】。同步助手会完成从固件下载到刷机全过程，一般情况下用户资料可保留，但也可能因为跨越大版本更新导致数据丢失，所以一定要在刷机前做好数据备份。
注意：如果你的设备开启了“查找我的iPhone功能”，建议先关闭。因为如果忘记密码会造成刷机后无法激活设备。请前往“设置>>iCloud>>查找我的iPhone”关闭开关。
耐心等待刷机完成，只需要几分钟就从iOS10成功降级到iOS9.3.5。
回到同步助手“我的设备”页面，点击页面底部的“同步推”，安装同步推，海量游戏和应用等你来体验。
升级方法二：通过iTunes降级
1.根据机型下载好对应的iOS9.3.5固件。由于iTunes下载固件的速度较慢，推荐使用同步助手来下载固件。只要切换到刷机越狱界面，同步助手会自动匹配适合你设备的固件，点击下载，完成后点击【打开】就能在本地电脑中找到下载好的iOS9.3.5固件。
将 iTunes 更新到最新版，打开 iTunes 并连接设备，点击左上角图标进入设备摘要页。
点击【立即备份】备份设备上重要数据，以防万一。
然后按住键盘上的 Shift，同时鼠标点击 iTunes 界面的【检查更新】按钮，再选择对应版本的 iOS9.3.5 固件进行降级。温馨提示：千万注意是选择更新而不是恢复，否则手机里的数据会被清空。
12
成功降级到 iOS9.3.5，然后在设备上按照提示激活即可。
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