Hello, In a few days I am expecting with air-mail a brand new Xiaomi Mi2s (16GB) and I have some questions, just to be ready I do not have any previous experince with MIUI except a bad flash with an early version of MIUI on a ZTE Blade. Right now I am using a Galaxy Note2 (stock rom) and the Mi2S is going to replace it. So I need some clarifications: 1) Should I do a nandroid backup when I receive it ? Just in Case ? 2) I will need to update it to the latest 3.7.12 and also flash the multilingual package (as I need the Greek language) for 3.7.12. Is it a easy to follow and do procedure ? 3) Do I need to root it or is it already rooted ? 4) As the battery consumption is very important to me, is it feasible to undervoltage the cpu/gpu and also lower the clocks (like from 1.7 to 1.2 or 1.3) ? Is it possible to guide me to the correct direction ? I have seen the 3100mAh battery but it makes the Mi2S bigger and heavier. Thank you in advance for your replies PS. Happy to find you, greetings from GREECE !!!!