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.

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Reddit
reddit.com › r/asrock › secure boot unsupported after enabling it in bios
r/ASRock on Reddit: Secure boot unsupported after enabling it in bios
April 6, 2023 -

So trying to upgrade to windows 11. I had the error of no TPM 2.0 and secure boot disabled. So I went into the bios and got the TPM error to go away and also enabled secure boot. I had to disable the CSM to enable the secure boot but it wouldn’t boot windows with the CSM disabled so I turned it back on and was able to boot up fine.

The issue is that I am still getting the error that secure boot is the reason I can’t download windows 11. When I go to info I see secure boot state as unsupported. Not sure what to do from here. Not sure if the CSM being enabled is messing this up.

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EA Help
help.ea.com › home › technical issues › how to use secure boot
How do I use Secure Boot on my PC?
2 weeks ago - If Secure Boot State is Off, we’ll need to check the BIOS Mode and then enable it. If Secure Boot State is Unsupported, check with your motherboard manufacturer’s specification sheet or manual to see if Secure Boot is supported.
Discussions

Secure Boot Enabled in BIOS, but not Windows 11
Hello! I've recevently been trying to get Secure Boot enabled on my machine, and I am at a bit of a loss. This came about as I was getting error "PCR7 binding is not supported..." error for device encryption, and after some research it seems… More on answers.microsoft.com
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Secure Boot Enabled in BIOS, but not Windows 11
Hello! I've recevently been trying to get Secure Boot enabled on my machine, and I am at a bit of a loss. This came about as I was getting error "PCR7 binding is not supported..." error for device encryption, and after some research it seems… More on learn.microsoft.com
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Secure boot state unsupported
I thought any version of Windows ... updates but that doesn't seem to be the case. I have done some research online and it seems all I need to do is change from legacy to UEFI in the boot list option within the BIOS settings. This will then also allow 'Secure Boot State' which is currently unsupported. However, when entering BIOS (A15) there is no 'Boot List' option to enable me to do ... More on dell.com
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Question - Secure boot unsupported, Unsure, where do I find this, - . Find the answer to this and other Electronics questions on JustAnswer More on justanswer.co.uk
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1
January 31, 2025
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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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 - So, if you encounter the “Secure Boot is unsupported” error, it may be caused by one of the following factors: Your PC is set to UEFI mode but the TPM and Secure Boot features are disabled.
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MakeUseOf
makeuseof.com › home › windows › 5 ways to fix the "secure boot state unsupported" error in windows
5 Ways to Fix the "Secure Boot State Unsupported" Error in Windows
July 16, 2023 - Some of the common reasons behind the "Secure Boot state unsupported" error are: You'll likely see the error message if TPM is disabled or not installed on your computer. The error message will appear if Secure Boot is disabled in the BIOS.
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WinTips.org
wintips.org › home › fix: secure boot unsupported or unavailable (solved)
FIX: Secure Boot Unsupported or Unavailable (Solved) - WinTips.org
March 1, 2022 - CASE A: If the BIOS Mode is UEFI ... to UEFI, but the Secure Boot feature is disabled on your system. At this case skip to Part-1, to enable Secure Boot in BIOS/UEFI firmware settings. CASE B: If the BIOS mode is Legacy and the Secure Boot State is Unsupported or Unavailable, ...
Find elsewhere
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Diskpart
diskpart.com › aomei software › windows os installation › secure boot is unsupported: how to fix this issue easily
Secure Boot Is Unsupported: How to Fix This Issue Easily
September 3, 2024 - Therefore, the "Secure Boot is unsupported" error may be the result of one of the following: The TPM and Secure Boot features are disabled, despite the fact that your PC is configured to operate in UEFI mode.
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Windows Report
windowsreport.com › windows 11 › repair › secure boot state unsupported [windows 10 & 11 fix]
Secure Boot State Unsupported [Windows 10 & 11 Fix]
August 9, 2025 - If you are getting Secure Boot State Unsupported on Windows 11, then check the TPM module is enabled and activate secure boot in BIOS.
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Alphr
alphr.com › home › explaining secure boot state unsupported
Explaining Secure Boot State Unsupported
June 14, 2023 - Seeing “Secure Boot is ... the following reasons: Your Secure Boot and Trusted Platform Module (TPM) are disabled even though your PC is set to Unified Extensible Firmware Interface (UEFI)....
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Activision Support
support.activision.com › articles › trusted-platform-module-and-secure-boot
Trusted Platform Module (TPM) 2.0 and Secure Boot for Call of Duty
April 30, 2026 - Secure Boot State: Off Your system supports Secure Boot, but it’s currently disabled. Enable it in your BIOS. Secure Boot State: Unsupported Your system may not support Secure Boot.
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The Windows Club
thewindowsclub.com › the windows club › fix secure boot state unsupported error in windows 11
Fix Secure Boot State Unsupported error in Windows 11
January 11, 2023 - If you see the Secure Boot State Unsupported error in Windows 11, your system does not meet the requirements for Secure Boot. To fix this issue, first, check if the Trusted Platform Module is installed on your computer or not. If your system ...
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Microsoft Support
support.microsoft.com › en-us › windows › windows-11-and-secure-boot-a8ff1202-c0d9-42f5-940f-843abef64fad
Windows 11 and Secure Boot - Microsoft Support
Learn how to change settings to enable Secure Boot if you are not able to upgrade to Windows 11 because your PC is not currently Secure Boot capable.
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JustAnswer
justanswer.co.uk › electronics › r64q6-secure-boot-unsupported-unsure-find-this.html
Secure boot unsupported, Unsure, where do I find this, 64-bit operating system x64 base processor, secure boot state
January 31, 2025 - Access BIOS by pressing keys like F2, Del, or Esc during startup. Check if Secure Boot is available under Security or Boot menus and enable it. If missing, update your motherboard’s firmware to the latest UEFI version.
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AllThings
allthings.how › all things how › windows › how to fix secure boot enabled but not active on windows 11
How to Fix Secure Boot Enabled But Not Active on Windows 11
August 11, 2025 - ... After rebooting, check Secure Boot status in Windows. Press Win + R, type msinfo32, and press Enter. In the System Information window, look for “Secure Boot State.” It should now show as “On.”
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Izoate
izoate.com › home › blog › 6 proven methods to fix secure boot state unsupported in 2026
6 Proven Methods to Fix Secure Boot State Unsupported In 2026 - Izoate
December 6, 2025 - When Windows reports “Secure Boot State Unsupported,” it means the system cannot meet one or more requirements needed for Secure Boot to function correctly. Often this isn’t a hardware failure — but a misconfiguration or compatibility ...