Yeah, I did pretty good for myself in not needing one up until a mission in this Bam Bam club, there's so many guards (one with a knife) and I keep getting killed or.. I'll kill them and then die fighting -more- guards in the next stage but unfortunately it doesn't save my progress after I clear that downstairs of the club.
Yup, that's Bam Bam club, that what I have problem with this mission.
That why I need save beyond Bam Bam club mission so they can be find under Sleeping Dogs / Data.
You can use the trainer when it releases, which I'm guessing will be tonight.