I'm trying to install Windows 8.1 using a USB stick from UEFI mode. I used Rufus to format the USB stick as "GPT for UEFI".
The problem is that my PC can boot in UEFI mode only if I turn Secure Boot off. Secure boot in the BIOS is enabled and grayed out. Is there a way to boot from the USB stick in UEFI mode when Secure Boot is enabled? Alternately, is there a way to disable secure boot?
If anybody encountered the problem that the USB stick doesn't boot in UEFI mode you need to format the USB stick as FAT32 instead of NTFS. It will boot then in UEFI even if Secure boot is enabled, at least using rufus.
For the second problem namely how to disable secure boot when it's grayed out I haven't configured yet a solution for that.
Use universal iso creator and just create a bootable ISO. All laptops will accept this interface for boot and install.
Here is a link to the product- http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
The distro you need to select is windows 8.1 then select the iso then the drive you would like to use.
I have personally down 1000s of installs of windows 8.1 with this product without any issues.
Microsoft offers a free Windows media creation tool that does that. If your secure boot setting is greyed out, this may be your best bet.
From this Windows site, you can download a Windows 8.1 iso directly to a USB flash drive. That one works. I have used it.
Click the Create Media button downloads mediacreationtool.exe. Use that to prepare the flash drive.
