I'm sure that somebody else here may know the answer - I don't as I used an XTC clip within a week of getting my phone to obtain S-Off & Root.
I would, however, suggest using Google to search the web (I did so and found plenty of references which seem to suggest it is Android v2.3.3, but as I don't speak Asian languages I can't read most of the postings).
I would also suggest that you start putting more descriptive information in the title of your posts. Two different posts called "Help" and one called "Help with Desire S" are not much use to people just browsing the board - at least put something about what help you are looking for please. Can you imagine if everybody simply posted "Help" as the title for their post?