How to Fix Secure Boot Problems — Can't Enable, Violations, or Boot Failures on Windows
Secure Boot causing boot failures, violation errors, or can't enable Secure Boot in BIOS? Fix Secure Boot issues on Windows 10 and 11.
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Main Troubleshooting Guide
How to Fix Windows Boot Loop →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •"Secure Boot Violation" error on startup
- •Can't enable Secure Boot — option greyed out in BIOS
- •Windows requires Secure Boot but it won't enable
- •Blue screen after enabling Secure Boot
- •Linux dual boot broken after enabling Secure Boot
- •"Secure Boot state: Unsupported" in msinfo32
Common Causes
- ⚠Disk formatted as MBR instead of GPT (Secure Boot requires GPT)
- ⚠BIOS in Legacy/CSM mode instead of UEFI mode
- ⚠Secure Boot keys corrupted or need reset
- ⚠Unsigned drivers or bootloader installed
- ⚠Linux bootloader not signed for Secure Boot
- ⚠Firmware needs update for Secure Boot support
Solutions
Solution 1: Check Secure Boot Status
- 1Win+R → msinfo32 → look for "Secure Boot State"
- 2Should say "On" — if "Off" or "Unsupported":
- 3Check BIOS Mode: msinfo32 → "BIOS Mode" should say "UEFI" not "Legacy"
- 4If Legacy: you may need to convert disk from MBR to GPT first
- 5CMD as Administrator: mbr2gpt /validate /disk:0
- 6If valid: mbr2gpt /convert /disk:0 (non-destructive conversion)
- 7Then switch BIOS from Legacy to UEFI mode
Solution 2: Enable Secure Boot in BIOS
- 1Restart → enter BIOS (Del, F2, or F12 depending on manufacturer)
- 2Navigate to Security or Boot tab
- 3Disable CSM (Compatibility Support Module) first
- 4Then enable Secure Boot
- 5If greyed out: set BIOS Admin password first (some require this)
- 6Save and exit
- 7If Windows won't boot after: you may need to convert from MBR to GPT first
Solution 3: Reset Secure Boot Keys
- 1If Secure Boot is causing boot failures:
- 2In BIOS → Secure Boot → Key Management
- 3"Reset to Default Keys" or "Install Default Secure Boot Keys"
- 4This restores Microsoft's trusted keys
- 5For Linux dual boot: install a signed bootloader (shim-signed)
- 6Ubuntu/Fedora include signed bootloaders by default
- 7If all else fails: disable Secure Boot temporarily to boot, then fix the issue
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