UEFI Fails To Boot From USB Stick

Oct 22, 2015

Downloaded Windows 10 ISO, created a bootable flash drive using "Windows 7 USB DVD download tool" which I also got from Microsoft.

Set first boot device to USB in BIOS.

Saved changes and turned laptop off.

Turned it back on, with the flash drive plugged in, but computer boots to Windows 8.1 instead of the Windows 10 installation.

Restarted again, and pressed F9 to show a list of boot devices, it just shows OS boot manager, and DVD drive, not the flash drive.

Tried with Windows 8.1 USB installer, same thing happens.

Went back to BIOS, enabled "Legacy Mode" and turned off "Secure Boot", restarted, the computer can now boot to the USB stick.. for both Windows 8.1, and Windows 10.

Disabled Legacy Support, the computer fails to boot to USB devices again.

So, I cannot boot to a USB device if I have Legacy Mode disabled in my BIOS.And if I boot using Legacy Mode, Windows wants to convert my GPT HDD to MBR.

How do I boot to USB using UEFI instead of Legacy?

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