deleting the lists folder should work as Maxternal mentioned... if your wii is online, downloading titles (gametdb) should force a cache refresh as well....I think you could just delete the right file in the /wiiflow/cache/lists/ folder ... or all of them for that matter ... or just get him to upgradeI have a friend still using r415 of WiiFlow - not WiiFlow-mod He added a new game manually by copying the iso image but WiiFlow isn't picking it up. Anyone remember that far back how to force rebuild the cache?