The "Failed to save data" error in Prototype 2 is often resolved by running the game as an administrator, ensuring Controlled Folder Access allows write permissions, or disabling OneDrive sync for the save folder. Limiting CPU cores to 4 or 8 via msconfig or applying community patches, such as the PrototypeFix mod, can also fix stability issues causing this error. For comprehensive fixes and guides, visit PCGamingWiki . Failed to save data message preventing play
Lack of administrative privileges is a common reason for "failed to save" messages. prototype 2 failed to save data fix
This usually happens for three reasons: