After installing the KB3133977 update on Windows 11, some ASUS users have reported encountering a Secure Boot error on the BIOS screen. This issue prevents the system from booting normally and can be confusing for many.
The Secure Boot feature is designed to protect your PC from unauthorized software loading during startup. When it encounters an error, it means your system’s security settings may have been altered or corrupted.
This article will guide you through simple, step-by-step solutions to fix the Secure Boot error on your ASUS BIOS screen and get your computer running smoothly again.
All instructions are explained in the most basic terms to ensure anyone can follow along, regardless of technical experience.
Quick Note Before You Begin
- Make sure your PC is fully powered off before entering BIOS settings.
- Have your ASUS motherboard manual or model number handy for reference, if possible.
- Ensure you understand that changing BIOS settings can affect your system’s boot process.
- Back up any important data, if you can access your system before troubleshooting.
Step 1: Access the BIOS Setup
To fix the Secure Boot error, you need to enter the BIOS settings on your ASUS PC. BIOS (Basic Input/Output System) controls hardware configurations and security settings.
- Turn off your computer completely.
- Press the power button to turn it on, then immediately start pressing the Delete key repeatedly. Some ASUS models may require F2 instead.
- Wait for the BIOS screen to appear. This is usually a blue or black screen with system information.
Why this is important: Accessing BIOS allows you to check or correct the Secure Boot settings that might have been changed by the update.
Step 2: Check Secure Boot Status
Once inside the BIOS, locate the Secure Boot settings. This is usually found under the Boot, Security, or Authentication tab, depending on your ASUS BIOS version.
- Use the arrow keys to navigate to the Boot or Security tab.
- Find the option labeled Secure Boot.
- Check if Secure Boot is enabled or disabled.
If Secure Boot is disabled, try enabling it. If it is enabled and causing errors, you may need to temporarily disable it to proceed.
Step 3: Reset Secure Boot Keys
Sometimes Secure Boot errors occur because the Secure Boot keys are corrupted or missing. Resetting these keys can restore normal operation.
- In the Secure Boot menu, look for an option like Reset to Setup Mode or Restore Factory Keys.
- Select this option and confirm when prompted.
- Save your changes by pressing F10 and then select Yes to exit BIOS.
Why this matters: Secure Boot keys are digital signatures that verify the integrity of your system’s boot files. Resetting them clears any corrupted data.
Step 4: Disable Fast Boot Temporarily
Fast Boot can sometimes interfere with Secure Boot after updates. Disabling it might help resolve the error.
- Re-enter BIOS as described in Step 1.
- Navigate to the Boot tab.
- Find the Fast Boot option and set it to Disabled.
- Save changes and exit BIOS.
Step 5: Update Your BIOS Firmware
If the Secure Boot error persists, your BIOS firmware may be outdated or incompatible with recent Windows updates.
- Visit the official ASUS support website using another device.
- Enter your motherboard or laptop model number to find the latest BIOS update.
- Download the BIOS update file and follow ASUS instructions carefully to apply the update.
Note: Updating BIOS is an advanced step and should be done cautiously as incorrect updates can harm your system.
Alternative Method: Disable Secure Boot in Windows Recovery
If you cannot access BIOS or the above steps don’t work, try disabling Secure Boot from Windows Recovery Environment:
- Restart your PC and interrupt the boot process three times to trigger Windows Recovery.
- Go to Troubleshoot > Advanced Options > UEFI Firmware Settings.
- Click Restart to enter BIOS.
- Disable Secure Boot as described in previous steps.
Frequently Asked Questions (FAQs)
What is Secure Boot and why does it cause errors?
Secure Boot is a security feature that prevents unauthorized software from loading during startup. Errors can occur if security keys are corrupted or settings are changed by updates.
Can I leave Secure Boot disabled permanently?
You can disable Secure Boot, but it reduces system security by allowing unsigned software to run at boot. It’s recommended to keep it enabled if possible.
Will updating BIOS always fix Secure Boot errors?
Updating BIOS can resolve compatibility issues, but it’s not guaranteed. It’s one of several troubleshooting steps.
Is it safe to reset Secure Boot keys?
Yes, resetting keys restores default security settings, but you should only do this if you understand the process or follow trusted instructions.
Can KB3133977 update be uninstalled to fix this error?
Uninstalling the update might help but is not always recommended as it could leave your system vulnerable. Fixing Secure Boot settings is a safer long-term solution.
When Nothing Works
If you have tried all the above steps and still face the Secure Boot error, consider the following final options:
- Contact ASUS support for professional assistance specific to your model.
- Use Windows 11 recovery tools to reset or reinstall the operating system.
- Visit Microsoft’s official support website for guidance on KB3133977-related issues.
Attempting advanced recovery or reinstalling Windows should be done only if you have backed up important data.
Conclusion
Secure Boot errors after the KB3133977 update on Windows 11 can be frustrating, but most cases can be resolved by carefully adjusting BIOS settings. Starting with checking Secure Boot status, resetting keys, and disabling Fast Boot usually fixes the problem.
Updating your BIOS firmware is an effective next step if the issue persists. Always proceed cautiously and back up data when possible.
By following these simple, detailed instructions, your ASUS PC should boot normally without Secure Boot errors.