You cannot install Windows 11 with Legacy BIOS. Installing in Legacy or CSM mode on a modern UEFI BIOS is like buying a new car and disabling all of the safety and performance features.

So you'd either need to reinstall Windows 10 exactly as I wrote out with illustrated tutorials, install Windows 11 in UEFI mode which I again gave you illustrated tutorials showing how to do this, or if you want to try to convert your present install to UEFI you can try this method:
https://www.windowscentral.com/how-convert-mbr-...

Once you convert the install and enable UEFI mode in BIOS, hopefully Secure boot will be apparent in the BIOS settings.

If not, then again I told you every single step you should make, even provided your BIOS Manual, the latest BIOS Update, how to contact Asus Support or a dozen different Asus forums that can help you with the specific settings in your Asus BIOS, since they are all different.

There is no one else on the web who would have taken the time and effort to do all of this research for you, posted back step by step instructions, each step illustrated by a tutorial explaining how to do it.

🌐
ASUS
asus.com › support › faq › 1050047
How to Enable/Disable Secure Boot | Official Support | ASUS Global
3 weeks ago - After entering Secure Boot, select [OS Type]④, then adjust the setting you wish⑤. Note: Setting to 「Windows UEFI mode」 will activate Secure Boot; setting to 「Other OS」 will deactivate Secure Boot. Note: The Secure Boot state displayed on the screen cannot be changed manually but ...
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JustAnswer
justanswer.com › computer › r8uar-asus-590-tuff-gaming-m-i-m-trying-disable.html
Fix Greyed Out Secure Boot on Asus 590 Tuff - Q&A
You are correct; even with the latest BIOS version, Secure Boot can still be quite persistent. The important point here is that the "Secure Boot state" is set to "User." This indicates that Secure Boot is active and managed by pre-enrolled keys.
Discussions

ASUS TUF Gaming F15 inability to activate Secure Boot(solved)
Hey u/StonkZIp ! Looking for tech support? Remember to provide relevant information for your problem in detail (such as:- specs/model number/what you were doing etc.) If it's a BSOD, please provide the stop code (bottom left) Already done? Just wait for someone to respond! Join Our Discord Server Here! I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com
🌐 r/Asustuf
1
3
October 5, 2025
Secure boot is enabled but it shows "unsupported"
Hello , my spec is: M.B: Asus tuf gaming B560m-e and it's updated to latest bios version CPU: Core i5 11400f and I can't update my windows to windows 11 because of Secure boot problem in my bios setting there isn't any option to "enable" or… More on learn.microsoft.com
🌐 learn.microsoft.com
5
167
January 26, 2022
Secure Boot Enabled in BIOS, but not seen by Windows 11
i'm trying to install windows 11 on a new disk but i get two errors, that are a sort of paradox: motherboard asus x570 hero VIII wi-fi. the secure boot issue: set on UEFI secure boot in bios, but no way, is seen as legacy with no secure boot… More on learn.microsoft.com
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5
0
May 10, 2024
Secure Boot option is greyed out in ASUS BIOS. How to enable secure boot now?
This thread helped me. Set admin and user password, disabled fast boot. This set my secure boot to enabled. However, I got secure boot violation. So I had to go to secure boot keys and update each of them(5 in total) to system default. This fixed it. More on reddit.com
🌐 r/techsupport
163
62
September 4, 2021
People also ask

How to fix Secure Boot enabled in BIOS but not Windows 11?

If you are unable to enter Windows 11, you can still fix the secure boot-enabled problem through BIOS. Here are the steps that you have to follow in this regard.

  • Enter BIOS;settings using specific keys (check your system's manual to learn about keys)
  • Disable Fast Boot;settings through this option
  • Save Factory Defaults;to change the settings to the previous ones when the system was released by the manufacturer
🌐
easeus.com
easeus.com › computer instruction › (solved!) secure boot enabled but not active🔥
Secure Boot Enabled But Not Active - How to Fix?🔥
How do I enable Secure Boot without BIOS?

You can enable the secure boot option without BIOS through Windows. Here are the steps that you have to follow in this regard.

  • Press ctrl + R;to open the Run;dialogue box
  • Enter msinfo32;in that box
  • If it reads off;enable the secure boot option from BIOS
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easeus.com
easeus.com › computer instruction › (solved!) secure boot enabled but not active🔥
Secure Boot Enabled But Not Active - How to Fix?🔥
What happens if I enable Secure Boot in BIOS?

It will keep your system safe from any unauthorized application installation. Every time you download and run a file, it will verify the digital signature before allowing you to go ahead. In turn, you can easily learn which program is safe and which can be corrupted.

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easeus.com
easeus.com › computer instruction › (solved!) secure boot enabled but not active🔥
Secure Boot Enabled But Not Active - How to Fix?🔥
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 5519057 › error-enabling-secure-boot-on-asus-tuf-gaming-b550
Error Enabling Secure Boot on ASUS TUF Gaming B550-PLUS WiFi II - Microsoft Q&A
September 8, 2025 - From the boot, install Windows 11. Once the installation is complete, access the BIOS > Secure Boot > change it to active and the mode to standard.
Top answer
1 of 5
23

You cannot install Windows 11 with Legacy BIOS. Installing in Legacy or CSM mode on a modern UEFI BIOS is like buying a new car and disabling all of the safety and performance features.

So you'd either need to reinstall Windows 10 exactly as I wrote out with illustrated tutorials, install Windows 11 in UEFI mode which I again gave you illustrated tutorials showing how to do this, or if you want to try to convert your present install to UEFI you can try this method:
https://www.windowscentral.com/how-convert-mbr-...

Once you convert the install and enable UEFI mode in BIOS, hopefully Secure boot will be apparent in the BIOS settings.

If not, then again I told you every single step you should make, even provided your BIOS Manual, the latest BIOS Update, how to contact Asus Support or a dozen different Asus forums that can help you with the specific settings in your Asus BIOS, since they are all different.

There is no one else on the web who would have taken the time and effort to do all of this research for you, posted back step by step instructions, each step illustrated by a tutorial explaining how to do it.

2 of 5
2

Hi Alireza. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.

There's a November 2021 BIOS Update here if yours is not updated:

https://www.asus.com/Motherboards-Components/Mo...

Then you can read the Manual here to find out how to enable Secure Boot:

https://www.asus.com/Motherboards-Components/Mo...

If it's still not clear then contact Asus Support to find out how to enable Secure Boot on your BIOS:

https://www.asus.com/support/

You can also ask in Asus forums:

https://blog.feedspot.com/asus_forums/

Is Windows presently installed in UEFI mode, as this can make a big difference in Secure Boot showing up? If you're unsure type System Information in Search, open and look for BIOS mode.

If not installed to UEFI I'd consider reinstalling to UEFI either with WIndows 10 doing this gold standard Clean Install which includes everything that works best in Windows 10: http://answers.microsoft.com/en-us/windows/wiki...

or do a Windows 11 Clean Install:

https://www.groovypost.com/howto/clean-install-...

https://pureinfotech.com/clean-install-windows-11/

Make sure to create the bootable media using Media Creation Tool only, boot the media as a UEFI device, delete all partitions down to Unallocated Space to clear formatting, then select the Unallocated Space and click Next to let the installer create and format the needed partitions - which makes it foolproof.

Feel free to ask back any questions. If you'll report back results for each step it can help determine what else needs to be tried. I will stick with you until it is fixed.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4026426 › secure-boot-enabled-in-bios-but-not-seen-by-window
Secure Boot Enabled in BIOS, but not seen by Windows 11 - Microsoft Q&A
May 10, 2024 - ... If Windows does not see Secure Boot active, try resetting TMP keys in your BIOS to factory keys to see if that works, if not, check the support page for your PC or motherboard to see if there is any BIOS update available that may need to ...
Find elsewhere
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Gentoo Forums
forums.gentoo.org › board index › assistance › kernel & hardware
[solved] Secure Boot disabled: Asus Tuf Gaming motherboard - Gentoo Forums
May 5, 2025 - Is there a way to get more visibility into this process? tl;dr: I followed the instructions to enable SecureBoot, but it's still disabled, and I can't tell why. Solved: The firmware only enables Secure Boot when "OS Type" is set to "Windows UEFI Mode." To enable Secure Boot with custom keys, ...
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EaseUS
easeus.com › computer instruction › (solved!) secure boot enabled but not active🔥
Secure Boot Enabled But Not Active - How to Fix?🔥
August 11, 2025 - The most common reason that can be at the back of this issue is "Secure Boot Disabled" in UEFI firmware settings. It might be possible that this option is disabled in that setting but showing enabled in your Windows.
🌐
Asus
rog-forum.asus.com › t5 › rog-gaming-notebooks › windows-10-refuses-to-boot-while-enabling-secure-boot › td-p › 700677
Windows 10 Refuses to boot while enabling Secure B... - Republic of Gamers Forum - 700677
March 6, 2024 - Although you're using CSM option in its enabled state ( i.e legacy bios emulation enabled ) you can still boot UEFI:xxxxxxx drives( it's actually the bootloader on these drivers ) which formated with the GPT layout. that is why you can boot your "UEFI booted" windows. now... the topic of "secure-boot" is really peculiar and my hope for the rest of us to understand it better from official Asus rep... @cl-albert or any other official rep of Asus - can you please tell us consumers, for which features/activities does "Secure boot" ( in enabled state ) is required ?
🌐
Asus
rog-forum.asus.com › t5 › asus-software › windows-11-can-t-activate-secure-boot › td-p › 835536
Windows 11 - Can't activate secure boot - Republic of Gamers Forum - 835536
March 5, 2024 - Check if you need to convert MBR to GPT: https://www.howtogeek.com/245610/how-to-check-if-a-disk-uses-gpt-or-mbr-and-how-to-convert-between-t... Secure Boot requires GPT
Top answer
1 of 2
1

Hi,

Do the following: download PC Check Health, take a screenshot, and post a picture of your PC here:

https://support.microsoft.com/en-us/windows/como-usar-o-aplicativo-verifica%C3%A7%C3%A3o-de-integridade-do-pc-9c8abd9b-03ba-4e67-81ef-36f37caa7844

Thanks

2 of 2
0

Windows 11 requires that the device be UEFI- and Secure Boot–capable, have TPM 2.0, and meet the other minimum hardware requirements (CPU, RAM, storage, graphics, display, and Windows version) before Windows Update or the Installation Assistant will allow the upgrade.

From the described configuration:

  • Firmware TPM 2.0 is enabled and visible in tpm.msc.
  • Secure Boot is enabled in UEFI and reported as active in Windows.

In this situation, the remaining checks to focus on are:

  1. Confirm UEFI (no Legacy/CSM) and Secure Boot mode
    • In UEFI firmware, ensure the system is not booting in Legacy/CSM mode. The firmware must be set to UEFI mode, with Secure Boot capability enabled. Some systems allow both Legacy and UEFI; in that case, UEFI must be the first or only option.
    • If needed, use the Windows path to UEFI settings:
      1. Open Settings > System > Recovery.
      2. Under Advanced startup, select Restart now.
      3. On the blue screen, select Troubleshoot > Advanced options > UEFI Firmware Settings and then Restart.
    • In the firmware menus, verify that Secure Boot is enabled and that the system is booting in UEFI mode, not Legacy/CSM.
  2. Verify all Windows 11 minimum requirements
    • Storage: At least a 64 GB or larger storage device must be present.
    • System firmware: UEFI and Secure Boot capable (already configured, but must be recognized as such by Windows).
    • TPM: TPM 2.0 (already confirmed via tpm.msc).
    • Graphics: DirectX 12–compatible with WDDM 2.0 driver.
    • Display: 720p or higher, >9" diagonal, 8 bits per color channel.
    • Windows version: The current OS must be Windows 10, version 2004 or later, to upgrade via Windows Update.
  3. Use firmware menus to confirm boot mode
    • If there is still doubt about the boot mode, use the firmware boot menu to see how the OS drive is listed. For example, entries like UEFI: indicate UEFI mode. If only BIOS/Legacy entries appear, the system may still be in Legacy mode, which will block Windows 11.

If any of these checks fail (for example, the system is actually booting in Legacy/CSM mode or the current Windows 10 version is older than 2004), Windows Update and the Installation Assistant will continue to report that the device does not meet requirements even if TPM 2.0 and Secure Boot appear active.


References:

  • Windows 11 System Requirements
  • Windows 11 and Secure Boot
  • Boot to UEFI Mode or legacy BIOS mode
🌐
MiniTool Partition Wizard
partitionwizard.com › home › partition magic › secure boot is unsupported or off in windows 11/10? [fixed]
Secure Boot Is Unsupported or Off in Windows 11/10? [Fixed]
November 29, 2024 - What causes the Secure Boot unsupported/off/unavailable issue? On Windows 10/8/8.1, if you want to use the Secure Boot feature, it’s required to enable the UEFI mode which uses the GUID Partition Table (GPT).
🌐
ASUS
asus.com › support › faq › 1044664
[Desktop] Troubleshooting - 「Secure Boot Violation」 Appears at Startup | Official Support | ASUS Global
August 16, 2024 - disable the Secure Boot feature. Note: If you select and set as Windows UEFI mode, it means the Secure Boot feature is
🌐
ASUS
asus.com › me-en › support › faq › 1050047
How to Enable/Disable Secure Boot | Official Support | ASUS
After entering Secure Boot, select [OS Type]④, then adjust the setting you wish⑤. Note: Setting to 「Windows UEFI mode」 will activate Secure Boot; setting to 「Other OS」 will deactivate Secure Boot. Note: The Secure Boot state displayed on the screen cannot be changed manually but ...
🌐
DiskPart
diskpart.com › aomei software › free partition software › 3 ways to fix secure boot enabled but not active in windows 11/10
3 Ways to Fix Secure Boot Enabled But Not Active in Windows 11/10
March 14, 2025 - A common culprit is the "Secure Boot Disabled" status in the UEFI firmware settings. Although it appears enabled in the Windows interface, if this option is disabled in the firmware settings, the feature remains inactive, resulting in the above ...
🌐
BleepingComputer
bleepingcomputer.com › bleepingcomputer forums › hardware › internal hardware
Asus motherboard bios secure boot - Internal Hardware
March 16, 2026 - I have the exact same issue. I am using an ASUS Tuf Z390 Plus. I have enabled CSM, Secure Boot and changed Legacy to UEFI however that has not enabled Secure Boots in Windows 10 so cannot upgrade.