Question bootmgr_is_missing when using usb boot drive

[_KilL3R_]

I am trying to clean install a win 10 iso in an old PC with win 7. I have created a bootable usb device using rufus (latest ver.). I have set up the bios to configure booting from usb device. but after pressing anykey to boot from USB, it says BOOTMGR is missing.
the USB is MBR, for BIOS/CSM
I have redone the boot creation for the 4th time but still no luck. anything i have missed?

 

[Aeacus]

Rather than setting up the Win10 installation by yourself, using Rufus; use Windows Media Creation Tool instead;
download + guide: https://www.microsoft.com/en-us/software-download/windows10

I used it to upgrade my Win7 Pro OEM to Win10 Pro, twice (upgraded two PCs).

 

[TerryLaze]

Not all USBs come from the factory ready to boot.
Get the free version of easybcd and you can write a new mbr to any disk without losing any data. Just be extra careful of choosing the correct target disk.

Updating the MBR and Bootsector

The MBR is the very first code launched in the boot process by the BIOS. Its one and only job is to launch the bootsector code written to the active partition of your boot disk, which in turn is re…

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