Are you seeing a “Secure Boot Violation – Invalid Signature Detected” error while starting your PC?
This issue usually appears after a BIOS update, Windows update, OS reinstall, or hardware change, and it can prevent Windows from booting properly.
Don’t worry — this guide explains why this error happens and how to fix it step by step on Windows 10 and Windows 11. 👇
❗ What Is Secure Boot Violation Error?
Secure Boot is a UEFI security feature that allows your PC to boot only trusted and digitally signed software.
The error appears when:
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Windows boot files are not recognized
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The bootloader signature is missing or invalid
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Secure Boot settings don’t match your OS configuration
Common Error Messages:
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Secure Boot Violation
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Invalid Signature Detected
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Check Secure Boot Policy in Setup
🔍 Why Does This Error Occur?
The Secure Boot Violation error can happen due to:
✔ BIOS/UEFI update
✔ Installing another OS (Linux, older Windows)
✔ Corrupted boot files
✔ Changing boot mode (UEFI ↔ Legacy)
✔ Enabling Secure Boot on unsupported OS
✔ Resetting BIOS to default settings
✅ Method 1: Disable Secure Boot (Fastest Fix)
This is the most common and easiest solution.
🛠️ Steps to Disable Secure Boot:
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Restart your PC
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Press DEL / F2 / F10 / ESC (depends on motherboard)
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Enter BIOS / UEFI Setup
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Go to Boot or Security tab
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Find Secure Boot
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Set it to Disabled
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Press F10 → Save & Exit
🟢 Restart your PC — Windows should boot normally.
✅ Method 2: Change Boot Mode to UEFI (Very Important)
Secure Boot works only with UEFI, not Legacy/CSM.
Steps:
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Enter BIOS
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Go to Boot Mode / Boot Configuration
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Set Boot Mode = UEFI
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Disable Legacy / CSM
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Save & Exit
📌 If Windows was installed in Legacy mode, Secure Boot will fail.
✅ Method 3: Restore Secure Boot Keys (Advanced Fix)
If Secure Boot is enabled but keys are missing:
Steps:
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Enter BIOS
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Go to Secure Boot
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Select Key Management
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Choose Install Default Secure Boot Keys
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Save changes and restart
This restores Microsoft-signed boot keys.
✅ Method 4: Load Optimized / Default BIOS Settings
Sometimes incorrect BIOS settings cause the issue.
Steps:
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Enter BIOS
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Select Load Optimized Defaults or Load Default Settings
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Confirm
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Save & Exit
⚠️ After this, recheck Boot Mode & Secure Boot.
✅ Method 5: Repair Windows Boot Files (If Windows Is Corrupted)
If the error still appears:
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Boot from Windows 10/11 installation USB
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Click Repair your computer
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Go to Troubleshoot → Advanced Options
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Select Startup Repair
This fixes missing or corrupted boot signatures.
🧠 When Should Secure Boot Be Enabled?
Enable Secure Boot if:
✔ You are using Windows 10/11 (UEFI)
✔ No dual-boot OS installed
✔ System boots correctly with Secure Boot ON
Disable Secure Boot if:
❌ Using older OS
❌ Dual booting Linux
❌ Custom bootloaders or unsigned drivers
⚠️ Is It Safe to Disable Secure Boot?
Yes, for most users:
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Home users
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Gamers
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Normal Windows usage
Secure Boot mainly protects against boot-level malware, not daily threats.
❓ Frequently Asked Questions (Frequently Asked Questions)
Q1. What causes “Invalid Signature Detected” error?
A mismatch between Secure Boot settings and Windows boot files.
Q2. Will disabling Secure Boot harm my PC?
No. Windows will run normally for most users.
Q3. Can Windows 11 run without Secure Boot?
Officially no, but many systems still boot after installation.
Q4. Does this error damage hardware?
No. It is purely a software/firmware configuration issue.
Q5. Should I update BIOS to fix this error?
Only if recommended by the manufacturer. Incorrect updates can worsen issues.
🏁 Conclusion
The Secure Boot Violation – Invalid Signature Detected error is common and 100% fixable.
🔐 Disable Secure Boot
⚙️ Set correct Boot Mode (UEFI)
🧩 Restore Secure Boot keys
🛠️ Repair Windows boot files
Once settings match your Windows installation, your PC will boot normally again.
