Lenovo Thinkpad Yoga 260 w/Lenovo ThinkPad USB 3.0 Ethernet Adapter FRU:03x6903
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 And now… the 4 magic USB .efi solutions are working again. o_O 
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 @sudburr ok so I’m a bit confused. It appears that you can network efi boot these devices. Is your goal to legacy boot these devices? I can understand why the usb booting would work over network booting the same iPXE kernel if the netboot code is fault in the yoga’s firmware. We have seen the hand-off between firmware and iPXE fail on some of these lenovos in the past. 
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 Just trying to find the path of least resistance given our environment. The 4 USB .efi solutions are now working again. Murphy has passed out in the corner. 
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 @george1421 Like I mentioned above, the Lenovo ThinkPad 13 works perfectly with the same BIOS setup. No need for the USB solution that the Yoga 260 requires for UEFI/Legacy dual booting. I fully believe the problem is entirely with the firmware on the Yoga. Both work better now than they did 4 months ago with the BIOS version available then. 

