How to Fix Dev Error 6034 on Xbox?


A lot of people get the Dev error 6034 Xbox One when they play Call of Duty: Warzone or Modern Warfare. How to fix Dev error 6034? In this post, we will show you 4 ways to fix problems that really work. Both Call of Duty: Warzone and Modern Warfare are very popular games for PC, PS3, and Xbox. But these games can also have problems and errors, such as Modern Warfare Multiplayer not working, error code 6 driver, Dev error 6635, Dev error 6178, and the one we’re talking about here.

What is Dev Error 6034 on Xbox?

This error is caused by Call of Duty: Modern Warfare and Warzone game data that is broken or can’t be read. Dev error 6034 on Xbox means that Modern Warfare data packs or add-ons are out of date or don’t work well together. The way the game was set up could also be to blame.

Causes of the Dev Error 6034 on Xbox

What causes Xbox Warzone/Modern Warfare Dev error 6034? Even though we haven’t heard anything official from Activision support, we think we know what’s going on after looking at a lot of user reports and posts. Broken game files are the main cause of the Warzone Xbox Dev error 6034. Dev error 6034 can also be caused by a corrupt cache, game data packs that conflict, old GPU drivers, or a temporary glitch. So, how do you fix error 6034 on Xbox Dev? Let’s keep reading.

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How to Fix the Dev Error 6034 on Xbox?

When a user tries to start Modern Warfare on Xbox and gets the dev error 6034, there is a problem. This is a problem with almost every Modern Warfare map, so it’s not just one. Before moving on to the other solutions, see if the Modern Warfare game files are split between two storages like internal and external. If so, try moving all of the game files to the internal storage to see if that fixes the problem.

Method 1. Get Rid of the Cache on Xbox

The Xbox One’s cache could get messed up over time, leading to the Dev error 6034 Warzone Xbox. If you clear the cache files on your console, the error might go away.

Step 1: Press and hold the Power button until your console is completely off. Shut off every light.

Step 2: Unplug your console’s power cord and wait at least 30 seconds for the cached data to be erased.

Step 3: Plug the power cable back into your console and wait at least a minute, or until the white light on the power brick turns orange.

Step 4: Press the Power button to turn on your console, then start the game again to see if the Modern Warfare Dev error 6034 Xbox has been fixed.

Method 2. Clean the Reserved Space on Xbox

You might already know that the reserved space is where game patches and updates are kept. The Dev error 6034 Xbox One could happen if the game has trouble when it tries to use the space that was set aside. In this case, you can try to clear the space on the game board that is set aside.

Step 1: Turn on your Xbox One and go to the Call of Duty: Modern Warfare/Warzone game. To get to the game menu, press the Options button on your Xbox controller.

how to fix dev error 6034 on xbox

Step 2: Choose “Manage game and add-ons” from the menu that pops up. Then, go to “Saved Data” and open “Reserved Space” from the right panel of “Saved Data.”

Step 3: When asked, click “Clear reserved space” and then “Confirm.”

Step 4: When you’re done, turn off your console and then turn it back on to see if the MW Dev error 6034 Xbox is gone.

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Method 3. Change the DNS Settings of the Console

If your console’s DNS settings aren’t set up right or aren’t the best they can be, Modern Warfare may show the dev error 6034. The problem might be fixed by switching the DNS to OpenDNS or Google DNS.

Step 1: Press the Xbox button on the controller to get to the Settings menu.

Step 2: Now, click “Network” under “All Settings.”

Step 3: Then, click on “DNS Settings” under the “Advanced Settings” tab.

Step 4: Now, choose Manual and enter the following values for the primary and secondary DNS servers: OpenDNS

  • Most important:
  • The second number is
  • First:
  • Rest of it:

Step 5: Then save your changes and click Continue to see if the DNS Settings are working properly.

Step 6: Now, start Modern Warfare and check to see if the error 6034 is gone.

Method 4. Remove All of the Game’s Add-ons and Data Packs

If the game’s data packs or add-ons have different information, the game might show the dev error 6034. In this case, removing the game data packs or add-ons might fix the problem. Remember that you can clear the Xbox’s mac address (Settings > General > Network Settings > Advanced Settings > Alternative Mac address > Clear) and restart the console to fix the problem if you are asked to buy the game after removing an add-on.

Step 1: To open the game menu, move your Xbox controller over Modern Warfare and press the Options button.

Step 2: Click on Manage Game and Add-ons now.

Step 3: Then, click Add-ons and uncheck the boxes next to the following data packs. The name might be a little different. For example, Compatibility Pack 2 could be called Data Pack 2. (8 GB). Check the size of the pack as well:

  • Call of Duty Modern Warfare MP2 Pack (size 9.1 GB)
  • Call of Duty Modern Warfare Multiplayer Pack 3 (Size 3.4 GB)

Step 4: Now, save your changes and turn the Xbox off and on again.

After you restart the Xbox, check to see if the dev error 6034 is gone.
If the problem keeps happening, try taking out the following packs to see if it goes away:

  • MP Pack 3 (3.4 GB)
  • Data Pack 2 (8.0 GB)
  • Campaign and Spec Ops Pack (14.8 GB)
  • MP Pack (9.1 GB)
  • Data Pack 1 (18.0 GB)
  • Survival Pack (5.9 GB)
  • High Res Pack 1 (23.6 GB)
  • Resolution Pack

how to fix dev error 6034 on xbox

If not, try taking out all the packs except the ones below to see if the problem goes away:

  • Base Game (80.0 GB)
  • MP Pack (6.0 GB)
  • MP and SPEC Ops Pack (6.7 GB)
  • Campaign Pack (11.4 GB)
  • Spec Ops Pack (10.1 MB)
  • High Res Pack 3 (7.9 GB)
  • Operator Pack (10.1 MB)
  • Spec Ops Pack 1 (15.8 GB)
  • Spec Ops Pack 2 (2.5 GB)
  • High Res Pack 2 (9.9 GB)
  • Campaign Pack 2 (10.1 MB)
  • Campaign Pack 1 (10.1 MB)
  • MP Pack 2 (22.1 GB)

Also Read: How to Fix Error Code 4 on Warzone on Xbox!

If that didn’t work, try removing all data and texture packs except for the ones listed below to see if that fixes the problem.

  • Multiplayer pack 2 (22.1 GB)
  • Multiplayer pack (6.0 GB)
  • Multiplayer and Special Ops pack (6.7 GB)

If the problem is still there, try reinstalling the packs mentioned in step 8 from the Store instead of the game to see if the dev error 6034 goes away. If the problem is with your computer or a laptop/notebook, you can try using Restoro Repair, which can scan the repositories and replace broken or missing files. Most of the time, this works when the problem is caused by a broken system.


If the Dev error 6034 Xbox One keeps happening even after you’ve tried all of the above fixes, the game installation may be broken or corrupted. In this case, you might want to start over with installing the game. At least 200GB of space are needed to download this game. So, before you move on, make sure you have a copy of all important game data.

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