Mac and thumb drive issue

i own a 16 gb staples relay usb and has a guid partition table but i can't open format or create a bootable dmg (grayed out) with it please help me
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  1. Would you be able to post a screenshot of what you're experiencing? The bootable DMG you're trying to restore onto the flash drive, have you double-clicked the dmg so it mounts onto the desktop, or are you dragging the dmg itself into the source field?
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