Boot from Windows 11 installation media by selecting it in the boot menu. 2. Access Command Prompt via Troubleshoot > Advanced Options. 3. Use diskpart to identify the EFI partition, assign it drive letter S:, then run bcdboot C:\Windows /s S: /f UEFI to restore bootloader files. 4. If needed, manually rebuild BCD using bootrec commands. 5. Remove the S: drive letter from the EFI partition using diskpart. 6. Exit and restart the PC to test booting; if successful, Windows 11 loads normally, confirming the EFI bootloader repair is complete.
If your Windows 11 system fails to boot due to EFI bootloader issues—such as error messages like “Reboot and Select proper Boot device” or the system dropping into BIOS/UEFI without loading Windows—you likely have a corrupted or misconfigured EFI bootloader. Here’s how to repair it step by step.

1. Boot from Windows 11 Installation Media
You’ll need a bootable USB drive with Windows 11. If you don’t have one, create it using the Microsoft Media Creation Tool on another PC.
- Insert the USB drive and restart your computer.
- Enter the boot menu (usually by pressing F12, ESC, or DEL during startup—depends on your motherboard).
- Select the USB drive as the boot device.
- When the Windows setup screen appears, choose your language and click Next.
- Click Repair your computer in the bottom-left corner.
2. Access Command Prompt via Recovery Options
- Go to Troubleshoot > Advanced Options > Command Prompt.
This opens a command-line environment where you can repair the EFI bootloader.

3. Identify and Repair the EFI Partition
The EFI System Partition (ESP) contains the bootloader files. You need to verify and fix its structure.
Run these commands one by one:
diskpart list disk select disk 0 list partition
Look for a small partition (usually 100–500 MB) marked as EFI (Type: System). It’s typically FAT32.

select partition X (replace X with the EFI partition number) assign letter=S (assigns drive letter S: to it) exit
Now rebuild the boot files:
bcdboot C:\Windows /s S: /f UEFI
Note: Replace
C:
with your Windows installation drive if different (e.g., D:). You can verify the correct drive by usingdir C:\
to check for the Windows folder.
This command copies boot files to the EFI partition and sets up the UEFI bootloader.
4. (Optional) Rebuild BCD Manually if Needed
If bcdboot
fails or the system still won’t boot:
S: cd EFI dir (Check if Microsoft and BOOT folders exist)
If missing, proceed:
C: bcdboot C:\Windows /s S: /f UEFI
Or, for a full BCD reset:
bootrec /fixmbr bootrec /fixboot bootrec /scanos bootrec /rebuildbcd
Note: In UEFI systems,
fixboot
may show a warning—it’s normal. The key command isbcdboot
.
5. Remove Drive Letter from EFI Partition (Security Step)
After repair, unassign the S:
letter to prevent future conflicts:
diskpart select disk 0 select partition X (EFI partition) remove letter=S exit
6. Restart and Test
- Type
exit
to close Command Prompt. - Click Continue to restart the PC.
- Remove the USB drive when prompted.
- Let the system boot normally into Windows 11.
If successful, the issue is resolved.
Common Issues & Tips
- “Access is denied” during bcdboot? Ensure you’re running Command Prompt from recovery mode (not regular Windows).
-
No EFI partition found? You may need to recreate it using
diskpart
, but this is advanced and risky. - Dual-boot with Linux? The above steps may overwrite GRUB. You’ll need to repair GRUB afterward.
Basically, bcdboot
is the key tool for UEFI systems. As long as you correctly identify the Windows and EFI partitions, the repair is usually quick. Most EFI bootloader problems on Windows 11 can be fixed this way.
The above is the detailed content of How to repair the EFI bootloader on Windows 11. For more information, please follow other related articles on the PHP Chinese website!

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