I am using Spice AndroidOne. When I purchased it, there was Kitkat in it. It automatically requested for Lollipop update which I have granted. Later it has requested for Marshmallow update. When I tried to update it, it has given an error.
Now Android OS is eating all my data (3G) in one day without my permission.
How to rectify it. And also I want to go back to Kitkat version.
Kindly help me.