How to fix BOOTMGR is missing Windows 10

Causes of BOOTMGR Errors:
1.Windows boot sector is damaged, corrupted or missing.
2.Hard Drive Problems
3.BIOS Problems
4.Windows Operating System issues
5.BCD(Boot Configuration data) is damaged.
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Method 1: Run Automatic Repair
Method 2: Change Boot Sequence (or Boot Order) in BIOS
Method 3: Fix boot and rebuild BCD
Method 4: Use Diskpart to fix corrupted file system
commands used are:-
diskpart
DISKPART select disk 1
DISKPART select partition 1
DISKPART active
DISKPART exit
Method 5: Repair Windows Image
DISM /Online /Cleanup-Image /RestoreHealth
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Feel Free to ask queries regarding:-
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