Call Of Duty 4 Modern Warfare Update 21.1 -

Since I don't have specific information on update 21.1, I need to state that. However, I can provide a general idea of what typical updates for that game include. It's also possible the user made a typo, such as meaning update 1.21 or 2.1. In that case, suggesting that they check the correct version number or provide more context could be helpful.

Alternatively, perhaps the user is referring to the 2019 Modern Warfare game's update in 2021. Let's consider the timeline. The 2019 Modern Warfare had its last major update around 2021 with the Warzone Season 3 or something similar. However, I think the 2019 Modern Warfare's support ended in 2020 or 2021. The active game in 2021-2023 would be Modern Warfare II and III, and then the 2022 Modern Warfare. So perhaps the user is mixing up the titles.

Another angle is to consider that each game in the Modern Warfare trilogy (2019-2021) had their own set of updates. If it's the 2020 version (Modern Warfare II), the update 2.1 in 2020 covered the initial launch fixes, and subsequent updates went up to version 3.0 or higher. The "21.1" might be a mislabeling. Alternatively, maybe it's part of the Warzone mode's updates. The Warzone is a mode within these games, so their patch notes could be different. For instance, Warzone patches are often versioned separately, like 21.0 or something. Wait, Warzone 2.0 might refer to the 2022 open beta of Call of Duty: Warzone Mobile? Not sure.

Alternatively, maybe the user is talking about a European release date or a regional code. For example, some updates were regional and had different version numbers. But that's stretching it.