Solved

EFI USB Boot issues

Posted on 2016-10-02
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Last Modified: 2016-10-09
I have a new swanky Lenovo Yoga S260 laptop.

I am attempting to downgrade it to Windows 7 but having some issues.

I have created a bootable USB thumb drive and verified it works but just not with this Yoga laptop.

One other thing to note is that secure boot is disabled so that USB booting is permitted.

Here is a screenshot of the error I receive.

EFI Boot error
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Question by:nappy_d
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15 Comments
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41825785
Try to reboot in DOS mode or Safe Mode.

Also check whether the BIOS detects the motherboard.
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LVL 32

Author Comment

by:nappy_d
ID: 41825789
This is a Windows installer USB thumb drive . There is no booting into. DOS.

This computer is a uefi only bios.

As mentioned this bootable thumb drive works on other computers.
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LVL 80

Expert Comment

by:David Johnson, CD, MVP
ID: 41825831
You have to select which boot from USB, MBR or UEFI.  With my Bios I use the F8 key on boot and I will see various options i.e.
DVD
DVD UEFI
USB
USB UEFI
Hard Disk 1
Hard Disk 2
...
Hard Disk 8

If I have both a dual boot DVD and USB drive connected
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LVL 92

Expert Comment

by:nobus
ID: 41825868
if you point it to the correct boot device - it should be able to boot
you can also test the usb device on other usb ports - usb 2 or 3
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LVL 88

Expert Comment

by:rindi
ID: 41825922
Make sure the USB stick is formatted to FAT32. If it uses NTFS you can't boot it in EFI mode.
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LVL 46

Expert Comment

by:noxcho
ID: 41826074
Ditto rindi. Is it FAT formatted?
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LVL 32

Author Comment

by:nappy_d
ID: 41826125
As mentioned in my original post; "I have created a bootable USB thumb drive and verified it works but just not with this Yoga laptop."

Also, this flash drive is selected from a boot menu using the F12 key. F8 is not an option on the Lenovo BIOS.

The drive is properly formatted using these commands:
-diskpart
-list disk
-select disk 1
-clean
-create partition primary
-select partition 1
-format fs=fat32 quick
-active
-assign
-copied ISO files to flash drive
-made efi\boot dir
-copied \windows\boot\efi\
......etc

Any other suggestions?
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LVL 88

Expert Comment

by:rindi
ID: 41826144
Use the tool "WinSetupFromUSB" to create the boot stick. It is easy to use and works well:

http://www.winsetupfromusb.com/
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LVL 32

Author Comment

by:nappy_d
ID: 41826887
Same issue with this tool.
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LVL 88

Expert Comment

by:rindi
ID: 41826895
If your PC has USB 2 ports, try booting from those. If not, check the BIOS settings, you might be able to change how the USB ports work.
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LVL 32

Author Comment

by:nappy_d
ID: 41826943
All ports causing the same issue.
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LVL 88

Expert Comment

by:rindi
ID: 41826961
Did you check the BIOS whether there is something you can tweak for the USB ports?
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LVL 92

Expert Comment

by:nobus
ID: 41827479
test the stick on another system - it can be bad,
or there is something wrong on this system - are you on the latest bios update?
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LVL 32

Accepted Solution

by:
nappy_d earned 0 total points
ID: 41827803
Issue resolved with Rufus.

Not sure why but all is now functioning.
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LVL 32

Author Closing Comment

by:nappy_d
ID: 41835720
Self resolved.
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