Insert the Media (DVD/USB) in your PC and restart.
Boot from the media.
Select Repair Your Computer.
Select Troubleshoot.
Select Advanced Options.
Choose Command Prompt from the menu:
Type and run the command:
diskpart
Type and run the command:
sel disk 0
Type and run the command:
list vol
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.):
Type and run the command:
sel vol <number of volume>
Type and run the command:
assign letter=<drive letter>:
Type and run the command:
exit
In order to repair the boot record:
Type and run the command:
cd /d <drive letter>:\EFI\Microsoft\Boot\
Type and run the command:
bootrec /FixBoot
If you do not have the Installation Media:
Restart your PC
Tap rapidly on the <F8> key once the PC has turned on, but before the Windows Splash Screen appears. Be aware this may take several attempts. The timing for this option was shortened significantly from that in Windows 7.
Select Repair your computer from the menu that appears.
Select Command Prompt from the Advanced Options tab in the Troubleshoot screen:
Type and run the command:
diskpart
Type and run the command:
sel disk 0
Type and run the command:
list vol
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:
Type and run the command:
sel vol <number of volume>
Type and run the command:
assign letter=<drive letter>:
Type and run the command:
exit
In order to repair the boot record:
Type and run the command:
cd /d <drive letter>:\EFI\Microsoft\Boot\
Type and run the command:
bootrec /FixBoot
The next step is the same across all the operating systems:
Rebuild the BCD store.
First run the command below to back up the old BCD:
ren BCD BCD.old
Now recreate it using this command:
bcdboot c:\Windows /l en-us /s <boot letter>: All
These steps apply to any legacy drive used as a boot drive on any recent Windows Operating system.
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 disc or flash drive.
Click on the Repair your Computer link at the bottom of the Install Now screen.
Click on Troubleshoot
Select Command Prompt
Enter the following three commands in turn, following each by pressing the Enter key:
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
Restart the PC with the installation media removed to check if the repair worked
05-20-2020, 10:26 PM
How to repair the EFI Boot Folder Windows 10
