Win7/Win8.1 in the upgrade Win10 official version of the "lost operating system" solution after the restart

win10 official version after the upgrade process will encounter many problems, today, a friend encountered a more serious After the problem is restarted during the upgrade process, the prompt "Missing Operating System" appears, and today Xiaobian brings a solution for everyone

According to the Microsoft Community A user of (Microsoft Community) reported that the system restarted after the system upgrade progress indicated that “89% has been completed”. However, after entering the operating system loading process, the screen prompts “Losing the operating system”, and the boot process is terminated.

If you don't have a system such as a USB flash drive/disc at this time, the user can basically wash and sleep, because there is no way to start. Many users who use this method for Win10 upgrades are not very experienced in system installation and repair, so this kind of problem is undoubtedly "fatal" for them.

From the feedback of this question, this is not a case. Most users who have encountered this situation use ASUS notebooks with SSD solid state drives. Therefore, it is likely that Microsoft's compatibility optimization for related devices is not in place, which has led to such problems. Here to remind OEM equipment users, it is best to log in to the equipment manufacturer's official website to query Win10 upgrade recommendations, and follow the relevant guidance to carry out Win10 upgrade work, in order to improve the success rate.
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