: To ensure compatibility, it is often recommended to MOVE (not copy) your Save Game to the same USB drive.

FM4’s DLC system only performs a license handshake if connected to Xbox Live. When offline, it trusts locally cached files if placed in the correct title ID folder ( 4D53084D ). The USB acts as an extension of the Xbox’s storage, bypassing failed online validation.

This often happens if the DLC is not properly signed for your console or if you just "copy-pasted" the files without using an injection tool.