Rebuild BCD

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Repair the EFI Bootloader in Windows 11

If you do have the Installation Media:

  1. Insert the Media (DVD or USB) in your personal computer and restart.
  2. Boot from the media.
  3. Select Repair Your Computer.
  4. Select Troubleshoot.
  5. Select Advanced Options.
  6. Choose Command Prompt from the menu:
    1. Type and run the command:diskpart
    2. Type and run the command:select disk 0
    3. Type and run the command:list vol
  7. Verify that the EFI partition (EPS – EFI System Partition) is using the FAT32 file system. Assign a drive letter to it that is not already in use:
    1. Type and run the command:select vol <number of volume>
    2. Type and run the command:assign letter=<drive letter>
    3. Type and run the command:exit

 

Note: Go to the information at the end of this section of instructions.

If you do not have the Installation Media:

  1. Use one of the methods in the following article to boot into the Windows Advanced Startup Options Menu:
  2. Select Repair your computer from the menu that appears.
  3. Select Command Prompt from the Advanced Options tab in the Troubleshoot screen:
    1. Type and run the command:diskpart
    2. Type and run the command:select disk 0
    3. Type and run the command:list vol
  4. Verify that the EFI partition (EPS) is using the FAT32 file system and assign a drive letter to it that is not already in use:
    1. Type and run the command:select vol <number of volume>
    2. Type and run the command:assign letter=<drive letter>
    3. Type and run the command:exit
  5. To repair the boot record:
    1. Type and run the command:cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command:bootrec /FixBoot

Repair EFI Bootloader in Windows 10

If you do have the Installation Media:

  1. Insert the Media (DVD or USB) in your personal computer and restart.
  2. Boot from the media.
  3. Select Repair Your Computer.
  4. Select Troubleshoot.
  5. Select Advanced Options.
  6. Choose Command Prompt from the menu:
    1. Type and run the command:diskpart
    2. Type and run the command:sel disk 0
    3. Type and run the command:list vol
  7. Verify that the EFI partition (EPS – EFI System Partition) is using the FAT32 file system. Assign a drive letter to it that is not already in use.):
    1. Type and run the command:sel vol <number of volume>
    2. Type and run the command:assign letter <drive letter>:
    3. Type and run the command:exit

     

    Note: If you are running Windows 10 (version 1709 or newer), ignore step 8 and go to the information at the end of this section of instructions.
  8. To repair the boot record:
    1. Type and run the command:cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command:bootrec /FixBoot

If you do not have the Installation Media:

  1. Use one of the methods in the following article to boot into the Windows Advanced Startup Options Menu:
  2. Select Repair your computer from the menu that appears.
  3. Select Command Prompt from the Advanced Options tab in the Troubleshoot screen:
    1. Type and run the command:diskpart
    2. Type and run the command:sel disk 0
    3. Type and run the command:list vol
  4. Verify that the EFI partition (EPS) is using the FAT32 file system and assign a drive letter to it that is not already in use:
    1. Type and run the command:sel vol <number of volume>
    2. Type and run the command:assign letter=<drive letter>:
    3. Type and run the command:exit
  5. To repair the boot record:
    1. Type and run the command:cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command:bootrec /FixBoot

Rebuild the Boot Configuration Data (BCD) store in Windows 11 and Windows 10 (Version 1709 and newer):

Rebuild the BCD store.

  1. First run the command below to back up the old BCD:ren BCD BCD.bak
  2. Now re-create it using this command:bcdboot c:\Windows /s <boot letter>: /f ALL (You can add a switch before /s for the computer locale: /l <language code>. By default, /l en-us English USA is used.)
  3. bootrec /rebuildbcd

Rebuild the BCD store in Windows 10 (before Version 1709):

Rebuild the BCD store.

  1. First run the command below to back up the old BCD:ren BCD BCD.old
  2. Now re-create it using this command:bcdboot c:\Windows /l en-us /s <boot letter>: All

How to repair your Main Boot Record (MBR)

These steps apply to any legacy drive used as a boot drive on a Windows Operating System. It has been left here as a reference.

  1. Use the F12 key at the Dell Splash screen to enter the boot menu. It lets you boot from the Windows installation media or a bootable disk or flash drive.
  2. Click the Repair your Computer link at the bottom of the Install Now screen.
  3. Click Troubleshoot.
  4. Select Command Prompt
  5. Enter the following three commands in turn, following each by pressing the Enter key:bootrec /fixmbr

    bootrec /fixboot

    bootrec /rebuildbcd

  6. Restart the computer with the installation media removed to check if the repair worked.

 

source: https://www.dell.com/support/kbdoc/en-ca/000124331/how-to-repair-the-efi-bootloader-on-a-gpt-hdd-for-windows-7-8-8-1-and-10-on-your-dell-pc

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