any games that came with 6.x update use a different key to encrypt saves, emunand does not use any new keys, so it is unable to decrypt any saves for games which use the new key if played on a retail 6.x+ console, but all emunands use the same "old" key so emunand to emunand are cross compatible, retail to retail are cross compatible but if you have already played on a retail console...no,the emunand has no way of knowing how to decrypt the save,as it doesn't have access to the new key, so it cant read your save and you will have to start over....this also applies the other way, if you play on emunand then put your cart in a retail console it tries decrypting with the "new" key and obviously fails as its not been encrypted with the new key