Hi Michael
Rufus is software designed to create bootable USB drives. In contrast Etcher copies images to drives - it will not modify the mage that you are trying to write to a USB stick. It only copies it.
If your image is not capable of booting in a certain environment etcher will not change that. Rufus in contrast is able to add certain requirements to an image to make it boot in a target environment.
Cheers Thomas
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