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Why I can't install Windows 10 in non-UEFI mode? It doesn't boot from USB device!

post #1 of 4
Thread Starter 
Hello, I'm currently using Windows 8.1 Pro in UEFI mode and I want to install Windows 10 in non-UEFI mode, that's right, I don't wanna to install in UEFI, I want the normal mode. But every time I go to boot override and click my USB stick (not ''UEFI USB'') it looks like is gonna boot, but then returns to the BIOS without sucess. I also downloaded the Windows 10 ISO from official Microsoft site and used Windows 7 USB DVD Tool to make it bootable.

What am I missing here? I already tried disabling secure boot, disabling CSM and all that stuff, but it ONLY boots from UEFI USB and not normal one. Any help?
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post #2 of 4
Is the flash drive formatted as Fat32 or NTFS?

UEFI installation can occur if the flash drive is formatted to NTFS with windows installation.

If you definitely don't want to install windows in UEFI, format the flash drive to fat32 and put all the contents of the operating system's install iso into the drive. It should allow you to boot from it. There are instructions on the internet on how to do this.

You can also just change to legacy mode instead of UEFI mode through the BIOS settings, this is alot easier and allows you to install the operating system in non-uefi mode even if the flash drive is formatted to NTFS with the operating system installer in there.

TL:DR - The best way to force it to install in non-uefi mode is to run a windows installation off a fat32 formatted usb,
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Intel Core 2 Quad Q6600 Asustek P5Q-PRO Nvidia 9800 GTX+ Kingston DDR2 8gb 
Hard DriveOptical DriveCoolingOS
Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by benjamen50 View Post

Is the flash drive formatted as Fat32 or NTFS?

UEFI installation can occur if the flash drive is formatted to NTFS with windows installation.

If you definitely don't want to install windows in UEFI, format the flash drive to fat32 and put all the contents of the operating system's install iso into the drive. It should allow you to boot from it. There are instructions on the internet on how to do this.

You can also just change to legacy mode instead of UEFI mode through the BIOS settings, this is alot easier and allows you to install the operating system in non-uefi mode even if the flash drive is formatted to NTFS with the operating system installer in there.

TL:DR - The best way to force it to install in non-uefi mode is to run a windows installation off a fat32 formatted usb,

Actually the USB device was formated in FAT32 mode and even with that the only option was still UEFI, I tested with RUFUS and Windows 7 DVD Tool, same results. I tried to change Windows UEFI to Other OS in the boot option, but had the same problem.
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i7 7700k Asus Maximus IX Hero EVGA GTX 1070 FTW Corsair Vengeance LED Red 2x8GB 3000Mhz 
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WD 1TB 7200RPM Samsung 850 PRO 512GB Asus VG248QE Corsair Strafe 
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My gaming rig
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CPUMotherboardGraphicsRAM
i7 7700k Asus Maximus IX Hero EVGA GTX 1070 FTW Corsair Vengeance LED Red 2x8GB 3000Mhz 
Hard DriveHard DriveMonitorKeyboard
WD 1TB 7200RPM Samsung 850 PRO 512GB Asus VG248QE Corsair Strafe 
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post #4 of 4
Thread Starter 
But always at the top of BIOS was writed ''UEFI BIOS Utility'', I don't know if I need to go to the ''normal BIOS'', but I don't know how.
My gaming rig
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i7 7700k Asus Maximus IX Hero EVGA GTX 1070 FTW Corsair Vengeance LED Red 2x8GB 3000Mhz 
Hard DriveHard DriveMonitorKeyboard
WD 1TB 7200RPM Samsung 850 PRO 512GB Asus VG248QE Corsair Strafe 
PowerCaseMouseMouse Pad
Corsair AX860 Corsair Air 540 Steelseries Rival 100 Razer Goliathus Control V2 
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My gaming rig
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CPUMotherboardGraphicsRAM
i7 7700k Asus Maximus IX Hero EVGA GTX 1070 FTW Corsair Vengeance LED Red 2x8GB 3000Mhz 
Hard DriveHard DriveMonitorKeyboard
WD 1TB 7200RPM Samsung 850 PRO 512GB Asus VG248QE Corsair Strafe 
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Corsair AX860 Corsair Air 540 Steelseries Rival 100 Razer Goliathus Control V2 
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