Yoga 11s - how to boot from USB in UEFI mode (tried everything)

I have been trying for days to install Windows 7 on my new Yoga 11s in dual boot configuration with 8.1, with no luck.  Typical catch-22 problem -- can't boot from the install media in UEFI mode, and if booted in legacy mode, Windows won't install on GPT partition. I followed all the steps everywhere mentioned:  disabled secure boot, set boot mode and order in every possible combination, etc.  I followed these steps exactly to create a UEFI-bootable USB drive:http://forums.lenovo.com/t5/Windows-8-and-8-1-Knowledge-Base/Why-can-t-I-boot-from-a-USB-key-on-UEFI-ThinkPad-or-ThinkCentre/ta-p/1004621 I can boot easily from the USB in legacy mode, but in UEFI mode, when starting the machine, the USB is ignored.  If I go into Windows 8.1 recovery and do an advanced start and choose EFI USB, the machine thinks for a moment and then says: "System doesn't have any USB boot option.  Please select other boot option in Boot Manager Menu." Then I click OK and it offers only one option on the menu, Windows Boot Manager. I don't know if the lack of boot options is just a symptom of the USB not really being UEFI-bootable, or some other steps are needed to add boot options.  I even tried adding an item within the windows boot manager, but that didn't work, because even if it could work in principle I don't know the right settings. Has anyone actually made this work?  If so, what is the secret?

I had the same problem and a lot of frustration. I finally solved the problem by using a different USB key. I also had to go into boot options and select the USB key even though I had the USB key first in the boot order. Right now I am Re-imaging from my backup and pray for success. Although things may look brigth afterall I have to leave out some steam:The whole problem started with a screen error, which had to be repaired. So before sending it to repair I made an image backup, - just in case. I got an eight hour time window where I had to wait for a pickup of the computer,- very frustrating when you are having a job requiring traveling. After ten days the computer computer came back with a scrambled hard disk with at note saying that it was an software error, although it was no doubt an hardware error because it worked perfectly with an external monitor. I have not counted the number of hours this bad service has costs but it exceeds the value of the computer!  

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