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  • In my case it is not on C: Drive. Open diskmgmt.msc. I have a separate partition, 100MB in size and named as EFI partition. Commented May 26, 2020 at 8:04
  • You may be able to find a (community-made) Windows-based rescue CD/DVD/USB that contains all the required tools (mainly bcdboot) and isn’t as large as a full-blown Windows Setup medium.
    – Daniel B
    Commented May 26, 2020 at 10:22
  • Windows has a backup of the boot files at %WinDir%\Boot\EFI. Once copied over, you'll then need to recreate the BCD store from WinPE/WinRE via: bootrec /fixmbr && bootrec /rebuildbcd
    – JW0914
    Commented May 26, 2020 at 12:58