Fix: Dev Error 6034 in Warzone/Modern Warfare [PC/Xbox One]

# 1. Restart the Game (PC/Xbox)

The first and simple fix for Dev error 6034 Xbox One is to restart the game and your console. By doing so, a temporary glitch or cache can be cleared out. Just close the COD Warzone/Modern Warfare game normally and see if the error is fixed. If it still doesn’t work, you can try restarting your PC or Xbox One console.

# 2. Clear the Cache (Xbox)

The cache of the Xbox One may get corrupted over time, causing the Dev error 6034 Warzone Xbox. In this case, clearing the cache files on your console may get rid of the error.

# 3. Clear the Reserved Space (Xbox)

As you might know, the reserved space is used to store updates and patches of the game. Once the game runs into issues when using the reserved space, it may trigger the Dev error 6034 Xbox One. Under this circumstance, you can try clearing the reserved space of the game.

# 4. Remove Add-ons and Data Packs of the Game (Xbox)

Some users reported that they managed to get the Dev error 6034 Warzone fixed after removing the add-ons and game data packs. Here you may have a try.

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

# 5. Scan and Repair Game Files (PC)

One of the common reasons for the MW Dev error 6034 is related to broken game files. Here you can follow the steps below to manually clear the broken game files and repair them using

# 6. Change the DNS Settings (PC/Xbox)

Sometimes the COD Dev error 6034 Xbox can be caused by improper or non-optimal DNS settings of your device. Here you can try using a DNS server like OpenDNS or Google DNS to solve the error.

  1. Open All Settings and select Network.
  2. Navigate to the Advanced Settings tab and select DNS Settings.
  3. Select Manual from the drop-down menu, and then set the Primary DNS value to 67.222.222 and Secondary DNS to (OpenDNS), or for Google DNS.
  4. Save the changes and click on Continue to check if the DNS server works well.
  1. Right-click your current network and select Properties.
  2. Navigate to the Networking tab and select Internet Protocol Version 4 (TCP/IPv4), and then click on Properties.
  3. Select the Use the following DNS server addresses option, and then set the Preferred DNS server to 67.222.222and set Alternative DNS server to After that, click on OK to save the changes.

# 8. Reinstall the Game

If the Dev error 6034 Xbox One persists after trying all the above solutions, the game installation may get broken or corrupted. In this case, you can consider reinstalling the game completely.

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

# 9. Reset the Xbox One Console

If the Warzone Dev error still appears, you may consider performing a factory reset of your console. Since this operation will delete all files from Xbox, we highly recommend making a full backup of your Xbox.


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