BLZBNTAGT00000840 error in World of Warcraft is an issue that players encounter when trying to update the game. The most common reason is a temporary glitch or disconnection from the game server. If you are also struggling with the same, this guide will help you fix can’t update WoW error BLZBNTAGT00000840 with effective troubleshooting methods.
How to Fix Can’t Update World of Warcraft BLZBNTAGT00000840 Error on Windows 10
Reasons associated are listed below:
- Battle.net lacks admin access.
- Corrupt data in the game installation folder.
- Antivirus program or Windows Defender Firewall is blocking the program.
- Outdated Operating System and PC driver
Method 1: Basic Troubleshooting Methods
Here are a few basic methods to fix the WOW error.
1A. Restart PC – The general trick to resolve all the temporary glitches associated with World of Warcraft is to restart your computer.
1B. Check Game Requirements – If you are facing a WOW BLZBNTAGT00000840 error on startup, you have to check the basic requirements of the game and ensure that your PC satisfies them.
Minimum Requirements:
- CPU: Intel Core i5-760 or AMD FX-8100 or later
- CPU SPEED: Info
- RAM: 4 GB RAM (8GB for integrated graphics such as Intel HD Graphics)
- OS: Windows 7 / Windows 8 / Windows 10 64 bit
- VIDEO CARD: NVIDIA GeForce GTX 560 2GB or AMD Radeon HD 7850 2GB or Intel HD Graphics 530 (45W)
- PIXEL SHADER: 5.0
- VERTEX SHADER: 5.0
- FREE DISK SPACE: 70 GB
- DEDICATED VIDEO RAM: 2 GB
Recommended Requirements:
- CPU: Intel Core i7-4770 or AMD FX-8310 or later
- CPU SPEED: Info
- RAM: 8 GB
- OS: Windows 10 64 bit
- VIDEO CARD: NVIDIA GeForce GTX 960 or AMD Radeon R9 280 or later
- PIXEL SHADER: 5.1
- VERTEX SHADER: 5.1
- FREE DISK SPACE: 70 GB
- DEDICATED VIDEO RAM: 4 GB
1C. Ensure Proper Network Connection If there are any internet connectivity issues, check our guide How to Troubleshoot Network Connectivity Problems on Windows 10 to troubleshoot the same.
1D. Close Background Processes – Several users have confirmed that WOW error BLZBNTAGT00000840 can be resolved by closing all the background tasks running on your PC.
Method 2: Run Blizzard Battle.net as Administrator
This is one of the most common reasons that cause BLZBNTAGT00000840 in your Windows 10 PC. Certain permissions and features can only be accessed if you have granted admin rights to the World of Warcraft game. In this scenario, you can fix WOW error code BLZBNTAGT00000840 by following the below-listed instructions.
1. Right-click on the World of Warcraft shortcut on the desktop or navigate the installation directory and right-click on it.
2. Now, select the Properties option.
3. Then, switch to the Compatibility tab and check the box Run this program as an administrator.
4. Finally, click on Apply > OK to save the changes.
Also Read: Fix WoW Takes Forever to Launch in Windows 10
Method 3: Rename Cache, Interface and WTF Folders
There are few gaming files residing in folders like Cache, Interface and WTF that are responsible to store the basic information on the game, progress, and settings. If they are corrupt, you will face can’t update World of Warcraft. So, you are advised to rename the folders and check if it works.
1. Close all processes running in the background as instructed in the above method and press Windows + E keys together to open File Explorer.
2. Now, navigate to following path as depicted.
C:\Program Files (x86)\World of Warcraft
3. Now, find the following folders and right-click on them. Then, select Rename as shown.
- Cache
- Interface
- WTF
4. Now, rename the folders to something like Cacheold, Interfaceold, WTFold respectively.
Once you have renamed these folders, relaunch the game and check if you can fix error code BLZBNTAGT00000840 in your Windows 10 PC.
Method 4: Delete WOW Cache Folder
Several users face BLZBNTAGT00000840 during the startup and this issue could be resolved when the cache folder is removed completely from your computer. All the temporary files of the game will be deleted and the next successive startup will launch the game without any errors. If renaming the folders doesn’t work for you, the below-listed instructions will help you do so.
1. Navigate to the World of Warcraft folder.
2. Then, right-click on Cache folder and select the Delete option as shown.
Also Read: Fix WOW High Latency But Internet is Fine in Windows 10
Method 5: Disable Read-Only Attribute
The World of Warcraft game will run without any errors when you have granted proper custom attributes settings in UAC (User Account Control). If in case, the game and its components has only read-only components, you cannot modify or update World of Warcraft. This results in can’t update World of Warcraft on your PC. In this event, change the read-only attribute for the game as instructed below.
1. Launch File Explorer and navigate to World of Warcraft folder.
2. Now, right-click on Wow.exe setup file and select the Properties option.
3. Now, switch to the General tab and uncheck the box next to Read-only next to Attributes section as shown.
4. Then, click on Apply > OK to save the changes.
Method 6: Run Blizzard Repair Tool
If you still couldn’t fix Can’t Update World of Warcraft error BLZBNTAGT00000840, there may be some chances that your PC has some damaged gaming files in it. Damaged files may fill your computer due to an over protective antivirus suite or due to an update failure. Fortunately, you can resolve all these corrupt gaming files automatically with the help of a built in tool of Blizzard. Here are few instructions to run the Battle.net Repair tool.
1. Go to the directory of the Wow.exe setup file and select the Run as administrator option as shown.
2. If you are prompted by User Account Control window, click on Yes to proceed.
3. Now, switch to the Games tab at the top corner of the window and then select World of Warcraft from the list.
4. Then, click on Options followed by Scan & Repair from the drop down list.
5. In the next prompt, click on Begin scan and wait until the process gets completed.
Finally, restart your game and check if you can fix BLZBNTAGT00000840 error code.
Also Read: Fix Avast Not Updating Virus Definitions
Method 7: Additional Windows 10 Troubleshooting Solutions
Repair System Files – You will be repairing corrupt files by using inbuilt utilities namely, System File Checker and Deployment Image Servicing and Management.
Run Full Disk Cleanup – Few users have suggested that clearing some disk space in PC has helped them sort out WOW error code BLZBNTAGT00000840. Follow our guide 10 Ways to Free Up Hard Disk Space On Windows that helps you clear all unnecessary files in your computer.
Update Windows – You can also eradicate bugs in your computer and game by Downloading and Installing Windows 10 Latest Update.
Update Graphics Drivers – World of Warcraft, being a graphical intensive game, your graphics driver is essential for your gaming experience. Follow our guide 4 Ways to Update Graphics Drivers in Windows 10 to update your driver and check if you have fixed WOW error BLZBNTAGT00000840.
Reinstall Graphics Drivers – If you still face BLZBNTAGT00000840 error after updating your Graphical drivers, then Uninstall and Reinstall Drivers on Windows 10.
1K. Clear DNS Cache & Data
Few users have suggested that clearing the DNS cache and data on your PC has helped them fix BLZBNTAGT00000840 error code. Follow our guide on how to flush and reset the DNS Cache in Windows 10.
Also Read: How to Download Hextech Repair Tool
Method 8: Modify Windows Defender Firewall Setting
You will also face can’t update World of Warcraft, due to an over-reactive or over-protective antivirus suite in your Windows 10 computer. This prevents the connection link between the game launcher and the server. So, to fix this problem, you can Allow WoW through the Windows Firewall
Method 9: Temporarily Disable Antivirus (If Applicable)
Read our guide on How to Disable Antivirus Temporarily on Windows 10 and follow the instructions to disable your Antivirus program temporarily on your PC.
Method 10: Reinstall World of Warcraft
Any misconfigured files in World of Warcarft will lead to can’t update World of Warcraft BLZBNTAGT00000840 error even if you have followed all the above discussed methods and updated all the pending actions. So, in this case, you have no other option than to reinstall the game. Here is how you do it.
1. Hit the Windows key and type apps and features, then click on Open.
2. Now, search World of Warcraft in the list and click on it. Then, select the Uninstall option.
3. If you are prompted, again click on Uninstall.
4. Now, visit the Blizzard official site, and click on World of Warcraft.
5. Then, click on Download for Windows option and wait until the game gets installed on your PC.
6. Navigate to My downloads in File Explorer and double-click on the setup file to run the application.
7. Follow the on-screen instructions to install the game on your Windows 10 PC
Finally, relaunch the game and now you will have fixed WOW error code BLZBNTAGT00000840.
Recommended: Fix Blizzard Another Installation in Progress in Windows 10
We hope that this guide was helpful and you could fix can’t update World of Warcraft BLZBNTAGT00000840 error. Let us know which method worked for you the best. Also, if you have any queries/suggestions, then feel free to drop them in the comments section.
