![]() ![]() To fix the corrupted MBR, DBR or BCD, you just need your Windows installation DVD. How to Disable UEFI and Enable Legacy/CSM Boot Support.How to Set Windows 8 PC to Boot with Legacy BIOS Mode Instead of UEFI Mode.To learn more about how to change the boot mode, please check these articles: When you get the error message “Operating system not found or missing” during boot, try to change the boot mode from Legacy to UEFI, or turn off UEFI and Seure Boot, it might fix your problem. If you installed Windows 10/8 on a MBR disk, it also cannot boot in UEFI mode. If you configure a UEFI system to boot in Legacy mode, you’ll get the error message that saying operating system is missing or not found. The operating system installed on a GPT partition can only be booted in UEFI mode. Most Windows 10/8 computers come with UEFI firmware and Secure Boot enabled. Solution 1: Enable / Disable UEFI Secure Boot In this tutorial we’ll guide you how to troubleshoot the problem of operating system not found / missing in Windows 10 or 8. This issue can be caused by various reasons, such as MBR (Master Boot Record) or DBR (DOS Boot Record) is damaged, the BCD (Boot Configuration Database) is corrupt, or your system partition is not active. While booting Windows 10 or 8 computer, you might receive the following error message: ![]()
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