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How To Repair Broken EFI Partition

Steps:

1. Enter Windows Setup or Windows Recovery to get cmd (Command Prompt)
2. Make sure that both your Windows Partition and EFI Partition are assigned a drive letter
3. Use diskpart utility to assign a letter to the EFI Partition (i.e.: T:)
4. Make sure you know which drive letter each partition is assigned
5. When you’ve got both partitions ready with a drive letter use this command:
   1. C:\Windows\System32\bcdboot C:\Windows /s T:
6. That will cause the EFI bootloader files to be copied from you Windows Partition onto your EFI partition which should get it working.