Call of Duty: Warzone remains a big hit among series followers, but some players are getting frustrated by recurring bugs. One of the latest problems involves dev error 6635, which causes disconnects and crashes during multiplayer. This dev error code is particularly troublesome on Xbox Series X|S, where it’s been popping up at increasing frequency. Fortunately, there’s a simple way to fix dev error 6635 and get back into matches.
Call of Duty: Warzone | How to fix dev error 6635
Dev error 6635 in Call of Duty: Warzone seems to be caused by using certain Black Ops: Cold War character skins. When it appears, users will be kicked from matches or may experience an outright game crash. Thankfully, players report that you can fix dev error 6635 by swapping your selected operator skin, weapon, emblem, or calling card.
Numerous reports of error 6635 have appeared on the Activision Support forums, where players say they keep getting kicked from matches. However, several players have chimed in to say that the error code disappeared after choosing a new character skin. More specifically, the error resolved after swapping from a Cold War skin to one from Modern Warfare.
For whatever reason, dev error 6635 seems to be caused by using Cold War character skins specifically. As such, the easiest way to fix it is to choose another skin — any skin not from Cold War should do the trick.
This method first appeared when players reported that the error code went away after changing their entire loadout. Some suggested that using Modern Warfare weapons and calling cards helped. However, in many instances, these players also changed their active skin. Given all of the reports, it seems as if the chosen skin is the main problem. Still, if you have extra weapons, calling cards, and emblems available, it wouldn’t hurt to swap everything out and see what happens — again, not using anything from Cold War.
If you keep encountering dev error 6635 in Call of Duty: Warzone, remove any Cold War cosmetics from your loadout. Instead, choose operator skins, weapons, emblems, and calling cards from Modern Warfare. This should be enough to get rid of the error code and finally be able to complete matches without getting booted back to the menu.