Windows 8 and 8.1 Forums


Windows 8.1 USB boots to UEFI

  1. #1


    Posts : 4
    nothing because my pc dont work:(

    Windows 8.1 USB boots to UEFI


    Pretty much whats happening is everytime I boot up my USB for Windows 8.1 I get sent into my UEFI.

    CSM: Off
    Secure Boot: Off
    Fast Boot: Off
    Motherboard: Asus Z170 Pro Gaming

    Windows 8.1 USB made with Rufus.

      My System SpecsSystem Spec

  2. #2


    Posts : 2,675
    Windows 3.1 > Windows 10


    what is it you want to do - or what are you trying to do
      My System SpecsSystem Spec

  3. #3


    Posts : 4
    nothing because my pc dont work:(


    Quote Originally Posted by KYHI View Post
    what is it you want to do - or what are you trying to do
    Reinstall windows. I have no OS (long story) so I'm trying to get one on it.
      My System SpecsSystem Spec

  4. #4


    Posts : 2,675
    Windows 3.1 > Windows 10


    Do you already have the OS ISO or Setup Media??
      My System SpecsSystem Spec

  5. #5


    Posts : 4
    nothing because my pc dont work:(


    Quote Originally Posted by KYHI View Post
    Do you already have the OS ISO or Setup Media??
    I have a bootable USB set up made from an ISO.
      My System SpecsSystem Spec

  6. #6


    Posts : 2,675
    Windows 3.1 > Windows 10


    format USB stick FAT32 ( DO NOT USE RUFUS )
    Mount the ISO and copy all the contents of iso to usb
    boot from usb stick
    report back
      My System SpecsSystem Spec

  7. #7


    Posts : 4
    nothing because my pc dont work:(


    Quote Originally Posted by KYHI View Post
    format USB stick FAT32 ( DO NOT USE RUFUS )
    Mount the ISO and copy all the contents of iso to usb
    boot from usb stick
    report back
    No luck.
      My System SpecsSystem Spec

  8. #8


    Posts : 3
    Windows 10


    Quote Originally Posted by InsertNameHere View Post
    CSM: Off
    Secure Boot: Off
    Fast Boot: Off
    Motherboard: Asus Z170 Pro Gaming
    Restore the UEFI BIOS to default settings and then set the following settings.

    ASUS (Skylake, Kaby Lake) motherboards.

    CSM (Compatibility Support Module) - Allows you to configure the CSM items to fully support the various VGA, bootable devices and add-on devices for better compatibility.

    Secure Boot - Allows you to configure the Windows Secure Boot settings and manage its keys to protect the system from unauthorized access and malwares during POST.

    If you want to install Windows 8/8.1/10 in UEFI mode.

    Boot > CSM (Compatibility Support Module) > Launch CSM
    - [Auto]: The system automatically detects the bootable devices and the add-on devices.
    - [Enabled]: For better compatibility, enable the CSM to fully support the non-UEFI driver add-on devices or the Windows UEFI mode.
    - [Disabled]: Disable the CSM to fully support the Windows Security Update and Security Boot.

    Boot > Secure Boot > OS Type
    - [Windows UEFI Mode]
    - [Other OS]

    If you want to install Windows 7 either in UEFI mode or in Legacy BIOS mode (or if you dual-boot Windows 7 and Windows 8/8.1/10).

    Boot > CSM (Compatibility Support Module) > Launch CSM
    - [Auto]: The system automatically detects the bootable devices and the add-on devices.
    - [Enabled]: For better compatibility, enable the CSM to fully support the non-UEFI driver add-on devices or the Windows UEFI mode.
    - [Disabled]: Disable the CSM to fully support the Windows Security Update and Security Boot.

    Boot > Secure Boot > OS Type
    - [Windows UEFI Mode]
    - [Other OS]

    Quote Originally Posted by InsertNameHere View Post
    Pretty much whats happening is everytime I boot up my USB for Windows 8.1 I get sent into my UEFI.
    64-bit UEFI firmware: As long as the USB flash drive is FAT32 formatted and has \efi\boot\bootx64.efi file, it should be bootable in UEFI mode. UEFI mode do not require a partition to be set as active.

    You do not need to change the boot order of drives in your UEFI BIOS settings. If you have changed the settings, then restore the default settings.

    - Connect your Windows USB/DVD.
    - Restart the computer.
    - Press the correct key (ASUS motherboards F8) to enter the boot menu.

    To install Windows in UEFI mode you need to boot from the Windows USB/DVD installation media in UEFI mode (marked UEFI in the boot menu). To install Windows in Legacy BIOS mode you need to boot from the Windows USB/DVD installation media in Legacy BIOS mode (not marked UEFI in the boot menu).

    Source: Microsoft

    Windows Setup: Installing using the GPT or MBR partition style

    Many PCs now include the ability to use the UEFI version of BIOS, which can speed up boot and shutdown times and can provide additional security advantages. To boot your PC in UEFI mode, you'll need to use a drive formatted using the GPT drive format.

    Many PCs are ready to use UEFI, but include a compatibility support module (CSM) that is set up to use the legacy version of BIOS. This version of BIOS was developed in the 1970s and provides compatibility to a variety of older equipment and network configurations, and requires a drive that uses the MBR drive format.

    However, the basic MBR drive format does not support drives over 4TB. It's also difficult to set up more than four partitions. The GPT drive format lets you set up drives that are larger than 4 terabytes (TB), and lets you easily set up as many partitions as you need.

    Boot to UEFI mode or Legacy BIOS mode

    Boot into UEFI mode or legacy BIOS-compatibility mode when installing Windows from your USB, DVD, or network location.

    If you install Windows using the wrong mode, you won’t be able to use the features of that firmware mode without reformatting the drive.

    Select the firmware mode during bootup.

    1. Boot the PC. As the firmware starts to run, press the key that opens the boot device menu. For example, press the Esc, F2, F8, F9, F12, or other key to enter the firmware or boot menus.

    2. On the boot device menu, select the command that identifies both the firmware mode and the device. For example, select UEFI USB Drive or Network - BIOS.

    Note   Note
    You might see separate commands for the same device. For example, you might see UEFI USB Drive and BIOS USB Drive. Each command uses the same device and media, but boots the PC in a different firmware mode.
    For more info about UEFI mode and Legacy BIOS mode.
    Look at post #5 in this thread: Cant install Windows 10 because of GPT partition error message - Windows 10 Forums
    Last edited by Kiwi; 03 Feb 2017 at 01:21.
      My System SpecsSystem Spec

Windows 8.1 USB boots to UEFI
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