I recently bought my new laptop. Works great, but the keyboard randomly stops working, and ive heard flashing the bios will fix it.
So i put the stuff i needed on a usb, and booted from it.
but it doesn't let me boot, it says bootmgr is missing.
People on msi forums arnt really responding, so ill ask here.
Maybe someone knows a thing or two about it...

You must make the pen bootable. Look here.
If there's a bios image you can flash from Windows, that would be the easiest.

Quote from arco :

If there's a bios image you can flash from Windows, that would be the easiest.

That's too dangerous, Windows is not reliable enough to flash BIOS from it.

I had to reformat the USB stick. It works. I hope my probem is fixed now.