Rebuild Windows 10 EFI Boot Sector

fix_boot.bat

REM Start diskpart to assign the boot partition a drive letter to allow access
diskpart

REM Replace X with the number of the listed Windows disk
list disk
sel disk X

REM Replace Y with the number of the listed boot volume (type: SYSTEM)
list vol
sel vol Y

REM Feel free to use a different drive letter; I've always been a fan of v:
assign letter=v
exit

REM Repair boot record
cd /d v:\EFI\Microsoft\Boot
bootrec /fixboot

REM Back up the existing Boot Configuration Data (BCD) store and repair it
REM (Make sure the BCD parameters match your install!)
ren BCD BCD.bak
bcdboot c:\Windows /l en-us /s v: /f ALL
exit