About Call Of Duty: Warzone: Fatal Error “Unknown Function” Bug

This is not a common problem. Instead, it occurs after the recent update on June 3. After the previous update, the Warzone freeze and player are not restricted from joining the match.

The Fatal error occurring on the COD warzone is experiencing various platforms such as Desktop, Xbox and other consoles. But, after the recent update, users are facing this Unknown Function Bug. For which we would tell you a method through which you can fix it. So, without further ado, let’s check this out.

Fix: Warzone “Unknown Function” Fatal Error – Guide

There are several ways to fix this error; let’s check some potential method to resolve the Warzone “Unknown Function” Fatal Error.

Downgrading your NVIDIA Graphics Driver

It might be possible that the recent update on your driver might be creating conflicts. It not always the case; when an upgraded driver shows such error, instead, it helps to improve system performance, optimization, and stability. So, try rolling back the graphics driver. Here is the described instruction.

Downgrade GPU Driver on Windows 10

Open Device Manager from the Search box.
Then, Click on Display Adapter to Expand the option.
Double-Click on your Graphics Driver and then click on Roll Back Driver.
That’s it, Wait for the finish and then check whether the problem is resolved or not.

How to Roll-back Manually

You need to uninstall the current version of the Graphics driver from the App Uninstall. Afterwards, download and install the last version of your system supported graphics driver.

Open Official GeForce Drivers | NVIDIA

Fix: Warzone "Unknown Function" Fatal Error - How to Guide

Then, Search for your Graphics driver and then choose the previous version.

Click on Download and then confirm your action.

Save the file, and then install the Graphics Driver on your system.

That’s it.

Use additional Command in COD.

open Battle.net and head over to the Call Of Duty: Warzone
Click on the Game Settings from the option.
Check the Checkbox for “Additional Command Line Arguments.”
Enter -D3D11 and then hit enter
Select Done and Re-launch Warzone.

Delete Player Data File

Open This Pc, Use Windows + E Shortcut key.
Got to Documents and Open Call Of Duty Modern Warfare
Permanently remove the Player Folder and then Re-Launch Warzone.

Scan and Repair

Note: In case this doesn’t work, then simply here is the guide.

Launch Battle.net and head over to COD: Modern Warfare
Choose an option and click on Scan and Repair.
Next, It will automatically download and replace with the necessary missing file or corrupted file.
That’s it!

Delete Profile Game File

Launch Battle.net and then head over to the Call Of Duty: Warzone
Then, select the option and click on Show in Explorer.
There in the folder “Call Of Duty: Modern Warfare.”
Delete all the files except “Data.”
Revert to battle.net and click on the option
Choose “scan and Repair”, and it will analyze, Automatically download and replace the corrupted files so far.
That’s it

Disable Automatic Paging

Open the Control panel and then head over to the System.
Then, From the Left-panel, click on about.
There in the related settings, you can find Advanced System Settings.
Alternative: You can open the Advanced System Settings from the Windows Search.
Then, Click on Settings under Performance
Next, Uncheck the “Automatically Manage Paging File Size for all Drivers”
Choose “No Paging and then Select Set.
Click Yes, and then Ok to confirm your action.
Launch Warzone and check.

In case if the above-mentioned guide revert back with the same action. Therefore, it doesn’t help you to resolve the Unknown function Fatal error, then reported the same on Activision Support.

Hopefully, we can now expect that you all guys have Accurate content about Warzone fatal error code. And, also a well-known Method to fix Unknown Function bug in COD: Warzone. Despite this, If any user has any query share them with us in the comment section below.

Fix: Warzone “Unknown Function” Fatal Error – How to Guide