Normally, you do not need to change the UEFI firmware (BIOS) settings, for example, the boot order of drives, enable Legacy BIOS boot mode, or disable Secure Boot. So, do not change the UEFI firmware (BIOS) settings.
- Connect your Windows 8.1 USB flash drive or insert your Windows 8.1 DVD.
- Restart the computer.
- Press the correct key to enter the boot menu (see this link for help
). Or, if you have a Lenovo computer, you can also press the NOVO button when the computer is turned off and then select "Boot Menu".
- Select your USB/DVD from the boot menu.
If you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8/8.1 product key, the Windows 8.1 installer should automatically detect product key from UEFI firmware (BIOS). If the Windows 8.1 installer can't detect Windows 8/8.1 product key from UEFI firmware (BIOS), it means that you have the wrong installation media.