Can't get rid of this 'BOOTMGR is missing' error.I know this is a common problem and I tried googling it.And most of the solutions include plugging a boot device to reboot.Tried that
Fixed] BOOTMGR is Missing Windows 10/8/7 Without CD - EaseUS
Best 3 Ways to Fix BOOTMGR Missing on Windows 10
Fix BOOTMGR is Missing Error
✔️ 11 Solutions to "BOOTMGR Is Missing" Error in Windows 10/8/7
What Is Windows Boot Manager? (BOOTMGR Definition)
WINDOWS\SYSTEM32\CONFIG\SYSTEM is missing or corrupt
Bootmgr is missing" error and solutions (Windows 7) - YouTube
BootMGR is missing Press ctrl+alt+del windows 7 || solve bootmgr is missing using command prompt - YouTube
BOOTMGR is Missing: Fix for Windows Vista, 7, 8, 8.1, 10
Solved) How to Fix 'BOOTMGR is missing' Problem (Tested Solution)
Fix BOOTMGR is Missing Error During or After Windows 7 Install - Causes and Solutions