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0 I am going to do a clean install of windows 10 using usb stick. I followed the instruction successfully make a usb installation media. In the usb drive, you can see there is a bootmrg.efi file and in the sub folder efi /boot/ , there's a bootx64.efi . what is the difference between the two files, and which should I go for when I am in the motherboard Bios setting. I am sure when I get press F12 and get into Bios setting page, I need to choose a file for the for the USB bootable boot efi share | improve this question edited Jan 4 at 22:21 Tomasz Jakub Rup 606 4 13