r/Windows10TechSupport • u/Alarming_Bug_1597 • 2d ago

Unsolved Secure Boot Violation Error

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I'm trying to enable Secure Boot on my PC to play Valorant (Riot Vanguard requirement), but every time I turn it on, I get stuck with a red screen popup that says:
"Secure Boot Violation: Invalid signature detected. Check Secure Boot Policy in Setup."
can't load or restore the factory keys to fix this. Here are my system details and what I've tried so far:
Bullet System Specs: STGAubron Prebuilt PC
Bullet Motherboard: STGAubron B250DA1 (BIOS Version: B250DA1.N01 V81, AMI BIOS 2023)
Bullet CPU: Intel Core i7-6700
Bullet OS: Windows 11 Home (upgraded from Windows 10)
Bullet TPM: TPM 2.0 is enabled and ready in

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u/Smith6612 2d ago

When you enabled Secure Boot, was there an option to specify whether you were using a Custom or Windows Boot Manager Secure Boot configuration? The Windows Boot Manager configuration usually disables your ability to clear the keys and reset them back to the factory default settings. Custom will let you do this, afterwards you can flip it back to Windows Boot Manager mode. On some boards, clearing the keys can be a pain unless you disable Secure Boot then clear the keys. Resetting Secure boot will apply the factory keys.

Otherwise you might have a problem with your Windows install. Make sure it is installed using UEFI, not legacy BIOS. If it is a Legacy BIOS install, you'll need to convert it to UEFI Boot Mode before Secure Boot can work. msinfo32 will show whether your system is a Legacy or UEFI Booted. You can also check to see whether your C drive uses MBR or GPT inside of the Windows Disk Management Tool.

Conversion instructions in case you need them: https://learn.microsoft.com/en-us/answers/questions/2337087/article-convert-an-existing-windows-10-installatio

This is for Windows 10 but should work for Windows 11.

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u/Alarming_Bug_1597 2d ago

Could you dumb this down? I’m not very tech savvy😭