i checked and its not corrupted
Ok thats a good start, what exactly happened in your case? Was it like OP and you opened it up from sleep mode to find everything gone, like the message you quoted where it happened after they were managing data, or something else?
If you press and hold select while powering on does it say booted from sd or nand?
Above is mentioned a tool called tickdevil, have you tried to restore tickets at all? If not try running faketik to restore tickets.