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Hi,
I'm currently using Android 4.1.2. I want to update my phone to 4.3. But Update Center still says there's no update for my phone. Am I doing anything wrong?
No your doing nothing wrong - Updates are released at different times - This is country and network dependent
for more info contact Sony care http://www.sonymobile.com/global-en/support/contact-us/
Did you take it to service center???????
For xperia m 4.3 android can be upgradeable