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Old 05-20-2020, 10:26 PM
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Default How to repair the EFI Boot Folder Windows 10

If you do have the Installation Media:
  • 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
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Old 05-20-2020, 10:26 PM
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How to repair your MBR (Master Boot Record)

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
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Old 05-20-2020, 10:49 PM
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Default Replace EFI Folder

OR If you can go login to windows there you can create a fresh EFI and replace that with contents of EFI folder How to Dual Boot Windows 10 and catalina or any macos
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