![]() You need to reinstall your OS with prior formatting the disk. As a result, you get a computer with broken operating system. You may not have the original installation disc or a specially prepared a bootable USB drive. ![]() It often happens that for some reason become impossible to recover operating system, resulting in damage or even complete removal of the boot loader configuration (BCD). The only thing left to do is to restart your computer, after that the item Windows Boot Manager should appear when selecting boot devices from the list where you select the OS you want to load. ![]() By default, en-us is used - English (USA). f ALL - it means that it is necessary to copy boot environment files, including files for computers with UEFI or BIOS (it suggests theoretical opportunity to boot in EFI and BIOS systems) /l en-us - system locale type. Where C:\Windows is the path to the directory where Windows 10 is installed. ![]() With the help of bcdboot.exe utility, create again the BCD storage by copying boot environment files from the system directory: bcdboot C:\Windows /l en-us /s M: /f ALL Go to the directory containing the boot loader in a hidden partition cd /d m:\efi\microsoft\boot\Ĭreate again the boot sector: in the boot partition bootrec /fixbootĭelete the current file with BCD configuration by renaming it (save the old configuration as a backup copy): ren BCD BCD.bak Let us assign a random disk letter to the hidden EFI partition: select volume 1 assign letter M: In our example, we can see that EFI partition (you can see it from the size of 100 Mb and FAT32 file system) has the index “volume 1,” and the boot partition containing installed Windows 10 is marked as “volume 3.” ![]()
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