It is important to set realistic expectations. Sledgehammer Games and Activision stopped supporting Advanced Warfare years ago. The "5MB error" is a legacy bug from the Xbox 360/PS3 era memory management system. The engine expects a specific memory address for saving, and when Windows 10/11 or modern console updates change how that address is handled, the game panics and throws the generic "5MB" error.
Sometimes the game throws this error because it doesn't have the "write" permissions it needs to create temporary save files or shader caches. Steam Community Navigate to your game installation folder (usually Steam/steamapps/common/Call of Duty Advanced Warfare Right-click the folder and select Properties tab, click Select your user profile and check the box for Full Control , then apply the changes. Steam Community 4. Edit the Config File cod advanced warfare 5mb error fix