It isn’t a trick, disk image needs to be dd’d to disk, partition image to partition.
USB may have cd emulation boot mode (so it can boot from iso image) or normal UMS boot mode (so you need proper MBR/UEFI image). If you cannot boot live cd then either your bios does not support usb-cd-emulation or it’s not enabled there. If you cannot boot mbr image you uefi might have legacy boot mode disabled.
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