If you interpret the commands wrongly, you can accidentally delete all data on your hard disk. This guide implements working with disk partitions and is not recommended for beginners.

Is it possible to restore the Windows performance when removing the Boot Manager partition without reinstalling the system? Suppose that the EFI boot partition on your UEFI (non-BIOS) system was accidentally deleted or formatted (for example, when you tried to remove OEM recovery partition), and as a result Windows 10 (8.1 / 7) doesn’t boot constantly offering to select the boot device (Reboot and select proper boot device or insert boot media in selected). I’ll show you an easy way to manually rebuild the boot EFI and MSR partitions on Windows. This article often helped me after accidentally formatting or deleting the EFI partition on Windows 10. Initially, the article described my experience with restoring the boot EFI partition on Windows 7, but the article is also relevant for modern Microsoft operating systems (from Windows 7 to Windows 10).

In this article we’ll show how to manually repair accidentally deleted Windows boot partition on UEFI system. How to Restore Deleted EFI Boot Partition in Windows