Hit F12 when the pc is first starting and it should take you into the boot manager where you can select USB.
Hmm in that case have you tried pressing volume up instead of down when booting and selecting the USB drive from there?
EDIT: This is a separate menu I get when I press volume up on my 7140
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Same issue on the Dell Venue 8 Pro, the UEFI is only 32 bit even though the main processor is 64 bit. It means you can only install a 32 bit boot loader, and therefore a 32 bit OS.
thanks, at least that confirms it.
starting to regret not going Lenovo yoga 2, still paid my money and will live with it till I can afford something with a core m in it.