The Australian operator Telstra posted a list of Sony Xperia Z phones scheduled to get Android 5.1 Lollipop. Sony has been pushing out Android 5.0 to its Xperia Z series of smartphones since March.
A "showstopper issue" was spotted this month, thus causing the update to be paused. Telstra have not specifically talked about the bug, though it can easily be a previously reported memory leak issue.
After many attempts and has not found any solution about battery drain issues on xperia z, i finally mange to have it achieved. what i did was that i just download all the stock rom from jellybean 4.1 until lollipop 5.1.1 and flashed it one by one ...
I like Sony Xperia
Can't update my xperia z 5.0.2 into 5.1. when i download and install the update then my phone auto restarts then it always says "Update failed try again" can somebody help me?