Green screen Inaccessible_boot_device

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Guide: Fix INACCESSIBLE_BOOT_DEVICE and Windows Update Errors on Windows 11 Insider Preview

Symptoms Encountered:

• On startup: Green screen with the error code "INACCESSIBLE_BOOT_DEVICE".
• The PC redirects to the "Recovery" blue screen.
• Unable to access certain applications like Chrome or Firefox after restarting.
• Windows Update displays errors:
  • 0x800711c7 and 0x80246007.

Steps to Resolve the Problem

1. Disable Secure Boot in BIOS/UEFI

• Restart the PC and access the BIOS/UEFI (usually via F2, Del, or Esc during startup).
• In the Boot or Security settings, disable Secure Boot.
• Restart the PC. This temporarily bypasses boot issues.

2. Repair the EFI Bootloader with Diskpart and BCDboot

Access the Command Prompt

From the blue Recovery screen:

• Go to Advanced Options > Command Prompt.

Option A: Quick Repair of the EFI Partition

1. Launch Diskpart and identify the EFI partition:
   diskpart  
   list disk  
   sel disk 0       (replace 0 with your main disk number if different)  
   list vol   
   
   • Locate the EFI partition (marked as "System", formatted as FAT32).
2. Assign a temporary drive letter to the EFI partition:
   sel vol X      (replace X with the EFI partition number)  
   assign letter=Z:  
   exit 
3. Rewrite the UEFI boot files:
   bcdboot C:\Windows /s Z: /f UEFI
   • C: is the drive where Windows is installed.
   • Z: is the temporary drive letter for the EFI partition.

Option B: Delete and Recreate the EFI Partition (if Option A fails)

⚠️ Warning: This method deletes the EFI partition and recreates it. It will not erase your personal data, but follow each step carefully.

1. Launch Diskpart and delete the EFI partition:
   diskpart  
   list disk  
   sel disk 0      (replace 0 with your main disk number)  
   list part  
   sel part X      (replace X with the EFI partition number)  
   delete part override
2. Create a new EFI partition:
   create part efi  
   format quick fs=fat32  
   assign letter=Z:  
   exit  
3. Rewrite the boot files to the new EFI partition:
   bcdboot C:\Windows /s Z: /f UEFI

3. Reactivate Secure Boot

Once the PC boots correctly:

1. Return to the BIOS/UEFI.
2. Enable Secure Boot.
3. Ensure that UEFI mode is activated (disable Legacy/CSM).
4. Restart the PC.

4. Check and Repair System Files

From Windows, open the Command Prompt as Administrator and run:

sfc /scannow  

This repairs any corrupted system files.

5. Check Windows Update

• Go to Settings > Windows Update.
• Click on Check for updates and install everything available.

Conclusion

By following these steps:

• Your PC should boot correctly.
• Secure Boot can be reactivated.
• Applications like Google Chrome and Firefox will work again.
• Windows Update errors (0x800711c7, 0x80246007) will be resolved.

You can now share this guide on a forum to help others experiencing the same problem! If you need further refinements or additions, let me know. 😊