How to Fix Battlefield 6 Secure Boot & CSM Problems

Battlefield 6 requires Secure Boot to run its anti-cheat systems, which is causing a ton of problems! Unfortunately, on some motherboards, especially Gigabyte, ASUS, and MSI models, disabling CSM triggers can prevent you from entering BIOS anymore (PC boots straight to Windows). You get a black screen at startup, or your monitor shows nothing until Windows loads. This guide has some solutions for you.

Can’t Enter BIOS After Enabling Secure Boot for Battlefield 6

• You can’t enter BIOS anymore (PC boots straight to Windows)
• You get a black screen at startup
• Your monitor shows nothing until Windows loads

Cause: CSM disabled + DisplayPort connection = no BIOS display on some boards.

How to Fix Battlefield 6 Secure Boot & CSM Problems

Here's the quick fix checklist.

• Try HDMI instead of DisplayPort
• Try HDMI to onboard graphics
• Clear CMOS if BIOS won’t show
• Temporarily remove GPU if needed

I've had this issue previously and went through a rather annoyingly complicated ticket process with Gigabyte. They ultimately told me to buy a new graphics card to fix the problem. At the time, I was using a GTX 1070 and upgrading to an RTX 4070 fixed the problem. However, that is a lowsy unethical solution for this problem. Instead, after a lot of messing around, I found that the following solutions would also work. Though they aren't ideal, they work. Gigabyte and other board manufacturers were just too lazy to release a BIOS update that solves this problem for older cards.

IMPORTANT: Keep in mind that if your hardware doesn't meet the TPM 2.0 requirements, you won't be able to play BF6 regardless of enabling Secure Boot. Which means you need to upgrade your hardware.

Use HDMI Instead of DisplayPort

• Shut down your PC.
• Disconnect all DisplayPort cables.
• Connect a single monitor via HDMI to your graphics card.
• Power on, press Delete (or your BIOS key) repeatedly.

This works because some boards only output the BIOS signal over HDMI in UEFI mode.

Use HDMI to the Motherboard’s Onboard Graphics

• Keep using a single HDMI cable.
• Plug it directly into your motherboard’s HDMI port instead of your GPU.
• Restart and enter BIOS.

Clear the CMOS

• Power off and unplug your PC.
• Remove your graphics card if it blocks the CMOS battery.
• Locate and remove the coin-shaped CMOS battery.
• Wait 1 minute, then reinsert.
• Connect monitor via HDMI (preferably to the motherboard).
• Restart and try entering the BIOS.

Remove GPU Temporarily

If the above still fails:

• Remove your GPU completely.
• Connect the HDMI to the motherboard’s onboard graphics.
• Boot and enter BIOS.
• Adjust Secure Boot / CSM settings as needed, then reinstall the GPU.

IMPORTANT

• Once Secure Boot is enabled, you may need HDMI every time you want to enter BIOS unless the manufacturer fixes the CSM bug.
• The game will run fine after Secure Boot is active, this issue only affects BIOS access.
• If your Secure Boot menu disappears entirely, clearing the CMOS and reconnecting via HDMI usually restores it.
• Keep only one monitor connected during troubleshooting and testing.