CAMPAIGN SOLO

Hi Spartans !
Someone could tell me how to restore my data in campaign solo. i finishED all of them in legendary level and i would like to improve my stats with “score attack”, activating several scrolls but each time when the datas try to be saved at the end of the chapiter,it fails. did i do something wrong ? a paramater hidden forgotten or something ?
If a kind spartan have the answer , please tell me the way to follow .
thanks before.
Happy frags :slight_smile: !!