I have an unbranded, unlocked Z10 STL100-2. I upgraded to .90 by removing my movistar SIM and via wifi. And the same operation yesterday to update the same version. How can I find where this upgrade/update came from? The update was 7Mb and supposedly improved the battery performance. Also I am trying to download version .116 and would like to know if my Z10 will continue to improve. I am very happy with it, and the only reason I upgraded was to be able to install Whatsapp.