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mvidaldp/repair_windows_efi_bootloader.md

Created October 4, 2022 12:11
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Repair Windows' EFI bootloader (e.g. after Linux or another OS overwrittes it)
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repair_windows_efi_bootloader.md
  1. Use a Windows installation media and boot it
  2. Go to: Repair your computer > Troubleshoot > Advanced options > Startup Repair
  3. If it fails (like most of cases), go to: Repair your computer > Troubleshoot > Advanced options > Command Prompt
  4. There first run: diskpart
  5. Then run: list vol
  6. Select the Windows hidden partition: select volume X (where X is the number of the partition)
  7. Assign it a letter: assign letter=Y (make sure you assign an unused one)
  8. Exit diskpart, run: exit
  9. Run: bootrec /rebuildbcd
  10. Given that your Windows partition has the letter C: assigned, run: bcdboot c:\windows /s c:
  11. Reboot.
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