For a complete list of changes and fixes in Update 21, check out the official patch notes on the Call of Duty website.
Call of Duty: Ghosts - Deluxe Edition Update 21: What’s New and Improved?** Call of Duty Ghosts - Deluxe Edition -Update 21...
As with any update, there may be some known issues or bugs that players experience. If you encounter any issues, be sure to report them to the Call of Duty support team. For a complete list of changes and fixes