Solved Why is my device security different?

Silencious

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• Jun 4, 2026

• #1

Hi people, I was watching a youtube about secure boot and to check if I had any issues. The presenter said to click Windows security and then go to
device security which is shon here. But on my computer Windows 11 25H2
I have this
Can anyone tell me why? I have 64Bit. I also put in PowerShell as admin this command and I get this. Can someone help me or put my mind at ease?

 

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garlin

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• Jun 4, 2026

• #2

The entire Secure Boot section disappears from Device Security when Secure Boot is disabled.

From PowerShell:

Code:

Confirm-SecureBootUEFI

$true = Secure Boot ON
$false = Secure Boot OFF
Error = Legacy CSM mode

 

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Silencious

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• Jun 4, 2026

• #3

So I need to go back into the bios again?

 

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garlin

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• Jun 4, 2026

• #4

The only way to switch your Secure Boot mode is from BIOS. Otherwise a hacker could just disable it from Windows.

 

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Silencious

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• Jun 4, 2026

• #5

When I updated my Bios I thought it would remain in secure boot. I'll reboot and try again

 

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Silencious

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• Jun 4, 2026

• #6

Ok, so I rebooted into the BIOS, and it says that secure boot is enabled, and underneath it says 'not active'? Is this normal?

 

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garlin

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• Jun 4, 2026

• #7

Are you using Legacy CSM mode, instead of UEFI mode? Did you delete your Secure Boot certs at any time?

UEFI mode must be used for Secure Boot to work.

 

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Silencious

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• Jun 4, 2026

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Solved. After much thought. I went back to the BIOS, checked that CSM was in fact disabled, and that my BIOS mode was UEFI. Changed the standard mode in the BIOS to custom. Disable the secure boot and reboot into Windows. Went into recovery and advanced options, restarted the computer, and went into troubleshoot and UEFI settings. Back in the BIOS, checked the key management, reinstalled the keys, and re-enabled secure boot. Rebooted, and now...

 

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Silencious

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• Jun 4, 2026

• #9

Thanks Garlin for your time and effort

 

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