Call Of Duty 4 Modern Warfare Update 21.1 Instant

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.