Call of Duty MW4 Secure Boot: Fix Guide

This guide explains how to fix the Secure Boot error that can prevent Call of Duty: Modern Warfare 4 (the 2023 reboot, MW4) from launching on Windows 11. You will learn what Secure Boot is, why the game requires it, and the exact steps to enable it in your BIOS or UEFI firmware.

Why MW4 Requires Secure Boot

Secure Boot is a security standard developed by the PC industry to ensure that a device boots using only software that is trusted by the original equipment manufacturer (OEM). When you enable Secure Boot, the firmware checks the signature of the operating system kernel and boot drivers before loading them. This prevents malicious software, such as rootkits, from loading early in the boot process.

Activision and Infinity Ward have made Secure Boot a mandatory requirement for Call of Duty: Modern Warfare 4 on PC, likely as part of their anti-cheat system (Ricochet). The anti-cheat kernel driver needs to be loaded in a trusted environment, and Secure Boot helps guarantee that the driver has not been tampered with. If Secure Boot is disabled, the game may refuse to launch and show an error message like “Secure Boot is not enabled� or “Your system does not meet the requirements.�

What You Need to Check First

Before you dive into BIOS settings, verify that your system actually supports Secure Boot. Here’s a quick checklist:

• Windows 11: Secure Boot is a mandatory requirement for Windows 11. If you upgraded from Windows 10, it is likely already enabled.
• UEFI firmware: Your PC must use UEFI (not legacy BIOS). If your motherboard is more than 10 years old, it may only have legacy BIOS, which does not support Secure Boot.
• Graphics card and drivers: Make sure your GPU drivers are up to date, as outdated drivers can sometimes cause similar launch issues.

If your PC meets these prerequisites, you can proceed to the BIOS/UEFI settings.

How to Enable Secure Boot in BIOS/UEFI

The exact steps vary depending on your motherboard manufacturer, but the general process is the same. Here’s a step-by-step guide:

1. Restart your PC. As it boots, repeatedly press the key that opens the BIOS/UEFI setup. Common keys are Del, F2, F10, or Esc. The correct key is usually displayed on the first splash screen.
2. Navigate to the Boot or Security menu. Use the arrow keys to find a tab labeled “Boot,� “Security,� or “Authentication.�
3. Locate the Secure Boot option. It might be listed as “Secure Boot,� “Secure Boot Control,� or “Secure Boot State.�
4. Set it to Enabled. If it is already enabled, you may need to switch it to “Disabled� and then back to “Enabled� to reset the settings.
5. Change the Secure Boot Mode (if available). Some systems have a “Standard� and “Custom� mode. Choose “Standard� (or “Windows UEFI mode�).
6. Save and exit. Press F10 (or select “Save & Exit�) and confirm the changes. Your PC will restart.

If you cannot find the Secure Boot option, your motherboard may have a “Windows 8/10/11 WHQL� setting that must be enabled first. This is common on older UEFI systems.

What to Do If You Can’t Find Secure Boot

Sometimes the Secure Boot option is hidden or unavailable. Here are a few things to try:

• Check if your disk is GPT. Secure Boot only works with GPT partition style, not MBR. You can check this in Windows by opening Disk Management, right-clicking your system drive, and selecting “Properties� > “Volumes.� If it says “Master Boot Record (MBR),� you’ll need to convert it to GPT using the MBR2GPT tool (this is an advanced operation, so back up your data first).
• Reset BIOS to defaults. In the BIOS, look for an option like “Load Optimized Defaults� or “Reset to Factory Settings.� This can sometimes unhide Secure Boot options.
• Update your BIOS/UEFI. Check your motherboard manufacturer’s website for a BIOS update. Newer firmware often adds Secure Boot support and fixes bugs.
• Disable CSM (Compatibility Support Module). CSM emulates legacy BIOS and can prevent Secure Boot from being enabled. Look for a “CSM� or “Legacy Boot� option and disable it.

If you still can’t find it, your system may not support Secure Boot at all. In that case, you may be able to run the game with a workaround (see below), but it is not guaranteed.

How to Verify That Secure Boot Is Enabled

After changing the BIOS settings, you can verify that Secure Boot is active in Windows:

1. Press Win + R, type msinfo32, and press Enter.
2. In the System Information window, look for “Secure Boot State.� It should say “On.�
3. If it says “Off,� go back to BIOS and double-check your changes.

You can also use the command line: open PowerShell as Administrator and run Confirm-SecureBootUEFI. If it returns True, Secure Boot is enabled.

Common Problems and Solutions

Even after enabling Secure Boot, you might encounter issues. Here are some common problems and how to fix them:

• Game still says Secure Boot is off. This can happen if your Windows installation was originally set up with legacy BIOS. You may need to convert your disk to GPT and reinstall Windows in UEFI mode. This is a more complex process, so consider backing up your files first.
• PC won’t boot after enabling Secure Boot. This usually means your bootloader is not compatible. You can disable Secure Boot temporarily to get back into Windows, then use the MBR2GPT tool to convert your disk.
• Secure Boot option is grayed out. This often happens when CSM is enabled. Disable CSM, then try again.
• You have a custom PC build. Some motherboards require you to set a “Windows UEFI mode� or “Windows 8/10 WHQL� before Secure Boot becomes available.

If you have a laptop, note that some manufacturers (like certain Lenovo models) have a “Secure Boot� setting that is locked by default. You may need to set a BIOS supervisor password to unlock it.

Alternative Solutions and Workarounds

If you absolutely cannot enable Secure Boot, there are a few things you can try, but they are not guaranteed to work and may violate the game’s terms of service:

• Update your BIOS. As mentioned, a BIOS update might add the option.
• Use a Windows 10 dual boot. Some users have reported that the game runs on Windows 10 with Secure Boot disabled, but this is not officially supported and may stop working after a game update.
• Contact Activision support. They may have specific guidance for your hardware.

It’s important to note that bypassing Secure Boot is not recommended, as it weakens your system’s security and could get you banned from the game’s anti-cheat system. Always try to enable Secure Boot properly.

Frequently Asked Questions

Why does MW4 require Secure Boot?

Secure Boot is required to ensure that the anti-cheat driver is loaded in a trusted environment. This helps prevent cheating and keeps the game fair for all players.

Can I play MW4 without Secure Boot?

In most cases, no. The game will not launch if Secure Boot is disabled. Some users have found workarounds, but they are unreliable and may result in a ban.

How do I know if my motherboard supports Secure Boot?

Check your motherboard’s manual or the manufacturer’s website. Generally, any motherboard from 2012 or later that supports UEFI should have Secure Boot capability.

What is the difference between Secure Boot and TPM 2.0?

Secure Boot verifies the bootloader’s signature, while TPM 2.0 is a hardware chip that stores cryptographic keys. Both are required for Windows 11, but MW4 specifically checks for Secure Boot.

I enabled Secure Boot but the game still crashes. What else can I do?

Make sure your graphics drivers are up to date, verify the game files through Steam or Battle.net, and check that your Windows installation is fully updated. If the problem persists, reinstall the game.

Will enabling Secure Boot affect my other games or apps?

No, Secure Boot is transparent to most software. It only affects the boot process. Some older operating systems (like Windows 7) may not boot, but your current Windows installation should be fine.

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