Is there a way to discover when my Android OS was installed? In other word: what is the age of the SO running in my phone (since the last FW upgrade)?
I have root access and I prefer not installing any extra apps to this task (altough, if it is the only way, I may install one). I already have a Terminal Emulator App.
I looked into "Settings -> About phone" and there is a counter since the last reboot, which is not what I want.
I am running Android 4.0.4 on a Sony Xperia P.