Call of Duty Black Ops 6 players are often facing the “Our level fastfile is different from the server” error when they are trying to log into the shooter or when they are already on the lobby screen. When it occurs, they are not able to play the game, and the application crashes forcing them out.
It’s one of the more annoying performance issues to deal with and primarily occurs when there is a connectivity issue between your internet connection and the game’s servers.
So if you are getting the fastfile error message a lot in Black Ops 6, here are some of the things that you can do to try and fix it.
How to fix the “our level fastfile is different from the server” error in Black Ops 6

1) Reload the shooter a few times
The best way to deal with this error message is to reload the game a couple of times. As it’s a connectivity issue this will likely fix the “fastfile server” error that you are facing.
So while it may not look like a reliable fix for the error, this is one of the best ways to solve the performance issue.
2) Check if the game’s servers are live
You will face the error in the game if the shooter’s servers themselves are down or facing a connectivity issue. You can check the status of the server by making your way to the official COD updates X page.
If the servers are facing an issue then you will need to wait it out before they are stable again to log back in.
3) Make sure you have Black Ops 6 updated
Another reason why you might be facing the “fastfile server” error is the fact that you are trying to launch Black Ops 6 on an outdated version. You will be able to solve it by updating the game to the latest patch and then restarting it again.
You can even try re-installing the game from scratch as it will weed out corrupt files which may be in the installation directory.
4) Check if your internet connection is working optimally
The issue can be with your internet connection so you can try restarting your router or calling your internet provider if you are facing similar connectivity issues in other multiplayer titles.
What causes the “our level fastfile is different from the server” error in Black Ops 6?
As mentioned, the “our level fastfile is different from the server” error in Black Ops 6 is caused when there is a connectivity issue between your internet and the Black Ops 6 server. Hence, there are very simple fixes to this issue.