I have done this a hundred times but I am not getting my USB to boot from the drive. I use Rufus to make the bootable drive from a good bootable .iso. I format it with MBR partition scheme for bios or uefi. My computer has secure boot bios..so I disable secure boot and enable legacy in bios. The drive is formatted NTFS because Fat32 can't have a .wim over 4GB...This bootable does. Why doesn't my USB flash drive show up in the boot menu? What am I doing wrong? It works if I make it for UEFI when I'm doing a Wind 10 GPT scheme and formatting fat32?