Google play and all

not being lazy, I read most of the thread related to installing google play into my hongmi, but I'm more confused then when I have not.

I tried searching "google installer" in the mi market, however, I couldn't find any google installer in it.

Hence, I have few questions and hopefully you'll be able to help me,
1. How can I tell which version my hongmi is? this hongmi was bought by my aunt from china (shenzen) so I don't really know which version it was.

2. Can I just upgrade it (using...

Google play and all