Detailed explanation of "BOOTMGR is missing"
problem
Reconvery Your PC/Device needs to be repaired File:\windows\system32\drivers\bootsafe64_ev.sys In my crappy English translation, it means that your computer needs to be repaired. Use plug-in or usb repair tools to restore errors
How to solve?
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Click the following two links to make a UEFI boot
(Look at the tutorial first! Read the tutorial first! Look at the tutorial first!)
Download link: UEFI version download
Tutorial link: U boot to make a UEFI boot U disk tutorial -
Plug the prepared U-start into the problem computer and restart (manually press and hold the power button)
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Press the specified key to enter the BIOS system (computer Each key press was different, find their own different brands of laptop / desktop button to enter the BIOS )
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Under the BIOS boot, the operation of the USB disk PE system is similar to the CD-ROM boot setting method, as long as you find the USB option (some motherboards display the USB disk model), set it as the first startup item , and restart the computer to read the USB disk PE system
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After startup, the display is like this↓
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Up and down keys to select, which can be entered from top to bottom
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After entering, find the bootsafe64_ev.sys file and the kavbootc.sys file under the path \windows\system32\drivers\bootsafe64_ev.sys
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Delete—>Restart—>After entering the BIOS system, modify the startup item to boot from the hard disk—F10 to save and exit (or simply unplug the U disk and restart the computer)
Write at the end
I was stuck with a problem this afternoon for a long time, and my interest in solving it was worn out. When I was visiting Blink, I found that a big brother was asking for help, help him!