Methods to Fix BOOTMGR is Missing Error in Windows 10/8/7 - Data Repair Tools Article
Fixed] BOOTMGR is Missing Windows 10/8/7 Without CD - EaseUS
Fast and Easy Fix for BOOTMGR is Missing - iTechGyan
Fix BOOTMGR is missing – 11 Workable Ways
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
Bootmgr is missing" error and solutions (Windows 7) - YouTube