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clarenc3

unable to USB boot in UEFI, Lenovo Y400/Y500

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Morning all,

I'm having some serious problems booting into my Win7 install UEFI USB stick. I've been on v1.04, v2.02 and now on svl7's v2.02 mod, all with similar results.

On boot, I set:

USB Boot: Enabled

Boot Mode: UEFI

OS Optim.: Win864bit (should load UEFI settings I think).

To create my UEFI bootable USB I have tried:

Win7 download tool and a UEFI copy of win7,

Rufus, selecting UEFI/GPT boot and a UEFI win7 copy,

manually creating the efi/boot folder from a BIOS win7 copy

I've also played around with changing to legacy then changing to UEFI to "force" a UEFI drive scan, playing with disabling most boot settings in locked mode (e.g. WLAN=off, USB always on=off), and running off minimal internal setup (removing RAM, removing drives, internal keyboard/touchpad, etc). I've also tried all USB jacks.

I've had a few successes on which I can boot to the drive and it remains detected over successive boots along with Win8 but when I reconnect the USB, it's no longer detected.

On the few successful boots, it hangs after loading the install files. By "hang" I mean CPU fan turns off, no HDD/SSD activity and no USB stick activity.

Have I completely lost my mind and missed vital info, or does this board simply not like USB UEFI? Can anyone else please confirm this behaviour?

Thanks

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Just set

Boot mode : legacy support

Boot priority : legacy first

USB Boot : enabled

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Just set

Boot mode : legacy support

Boot priority : legacy first

USB Boot : enabled

Hey,

I have the same problem. Is setting legacy support really the solution. I dont't want to Windows install the comaptible mode. Is Windows building uefi drive drive although legacy support is selected? Otherwise it would be useless.

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Hey,

I have the same problem. Is setting legacy support really the solution. I dont't want to Windows install the comaptible mode. Is Windows building uefi drive drive although legacy support is selected? Otherwise it would be useless.

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Agree, I have had many problems trying to install Win7 in UEFI. I gave up and just instelled Win8.

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I'm pretty sure you can install in legacy mode then switch to UEFI afterwards and have no problems.

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I installed in my Y500 windows 7 uefi using rufus, in the bios I just set legacy support, UEFI first,USB Boot : enabled

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I installed in my Y500 windows 7 uefi using rufus, in the bios I just set legacy support, UEFI first,USB Boot : enabled

Possible to do the same for win8 64bit? Should not be a problem I think.

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