To be clear:

Some "legacy" content that was originally tied to now-defunct online services like

: Have an application like multiMAN , IRISMAN , or Apollo Save Tool installed to manage files. USB Drive : A USB flash drive formatted to FAT32 .

: Ensure your console is running CFW or has HEN enabled.

: Using tools like the AC Save Tool to inject a "blank" save file that flags all DLC content as "owned".