diskpart
(this is the Windows partition manager)
list vol
(note down your Windows partition letter. Default is C:)
list disk
(will list your drives)
Now select your Windows drive (for example “0”)
sel disk 0
list part
(will list your partitions on the selected disk)
select your EFI (System, 100 MB, for example “1”)
sel part 1
delete partition OVERRIDE
(this will delete your EFI)
create partition efi size=200
(this will create the new EFI partition with 200 MB size)
format quick fs=fat32
assign letter=B
(assign a letter to your EFI in order to manage it)
exit
(we can exit from diskpart now)
bcdboot C:\windows /s B:
(this will re-create the EFI files for Windows)
exit