If Windows fails to load due to a "Bootmgr is missing" error, the bootable environment provides tools to repair the BCD (Boot Configuration Data).
Open the Paragon application and locate the Recovery Media Builder tool. paragon partition manager bootable iso
Since the OS isn't running, you can move, resize, or delete any partition. If Windows fails to load due to a
Restart the computer and tap the (usually F12, F11, or Esc) repeatedly. Select the USB device or UEFI partition from the list. you can move