Ah, forgot about that.
Not sure if it'll show on Smart Switch, cause the device seems to be modified (cause it shows KT in settings), but try it out. Smart Switch usually does flash the entire stock firmware so if it does prompt an update, go for it.
Hopefully it'll show up. I really like the phone but if I'm not going to be getting any updates on it, I might just have to go for a Nokia with some plain ol' Android One, which I'm actually looking forward to. Cheers!