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  • Download Windows 11 ISO from Microsoft and write to USB.
  • Boot into Windows setup utility.
  • Select Repair computer –> Troubleshoot –> Advanced –> Cmd prompt.

This procedure assumes the following:

  • main disk is disk 0
  • EFI partition is part 1
  • Windows OS drive letter is c:

The following command will format the old EFI partition, mount it to s:, and copy the boot files to it.

diskpart
> list disk
> sel disk 0
> list part
> sel part 1
> format fs=fat32 quick label=System
> list vol
> exit
mountvol S: /S
bcdboot c:\windows /s s: /f UEFI /v
exit