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Suppose you have an iso image that contains a bios bootable partition. You can write this image to a usb disk

In linux you could do this for example with

dd if=pmagic_2013_02_28.iso of/dev/sdc1

Your USB disk is now bootable on computers with bios. However on my UEFI system, the usb disk does not boot. How can you make it EFI bootable?

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possible duplicate of RHEL Installation issue with UEFI. Different OS but offers canonical solution. – Braiam Jul 23 '13 at 3:43

Some magic of El Torito is required when creating the iso image. See this.

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This is not the answer for making bootable UEFI Device. But, you may want to try disabling systems UEFI boot option, like I did when I face the same problem.

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For the image to be (U)EFI bootable, it needs to have a primary VFAT32 partition containing the initramfs image file to be booted under the path /efi/boot/bootx64.efi.

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