微软官方解决方案
简要叙述:使用 Windows Device Recovery Tool 恢复到出厂固件;使用 Over-the-cable Updater tool for Windows Phone 8.1 and Windows Mobile 10 升级到 Windows 10 Mobile
Windows Device Recovery Tool 下载页面:https://support.microsoft.com/zh-cn/help/12379/
Over-the-cable Updater tool for Windows Phone 8.1 and Windows Mobile 10 下载页面:https://www.microsoft.com/en-us/download/details.aspx?id=56726