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Xperia J ST26i Android 4.1.2 Jelly Bean firmware Build Number 11.2.A.0.21 Rolled out in INDIA Confirmed, Is it a Global release ?
Have you got this update in your country ????
In INDIA Confirmed 
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Xperia J Android 4.1.2 Jelly Bean firmware Build Number 11.2.A.0.21 Details
How to Update Xperia J to Android 4.1.2 Jelly Bean Firmware Buil Number 11.2.A.0.21 - Full Tutorial
SOURCE - http://www.androidgyan.com/2013/03/update-xperia-j-to-android-412-jelly.html
Check the image of new notification bar of Xperia J Jelly Bean...
How to Update Xperia J to Android 4.1.2 Jelly Bean Firmware Buil Number 11.2.A.0.21 - Full Tutorial
SOURCE - http://www.androidgyan.com/2013/03/update-xperia-j-to-android-412-jelly.html
via - http://GizmoBolt.com I http://XperiaGuide.com
Message was edited by: AndroidGyan
Message was edited by: AndroidGyan
http://cauticeva.ro/xperia-j-jellybean-in-romania/ This is italian oficial version, withoute branding. Follow the steps and it will do 
Hello? I need help..
Yesterday I upgrade Xperia J my into Jelly Bean.
It succesfully installed on my phone, but.....
after the instalation, my phone can't connect to wifi signal..
I don't really understand about this phone or Android.
So please give me solution
Thanks :smileygrin:
But I'm Not Able To Update To Jelly bean 4.1.2 Although I Live In India!
Please See My Thread - http://talk.sonymobile.com/thread/124573
Buddy you can use "Sony Update Service" to update your phone if in case PC Companion not showing an update.
Or get it updated via Sony Service center via EMMA Software.
Or you can update manually.
Check here to update your Xperia J via above all 3 steps...
Source - http://www.androidgyan.com/2013/03/update-xperia-j-to-android-412-jelly.html
Since whether PC Companion nor SUS showed up an update since recently I've decided to follow your guide and also the instructions from the xda-developer forums and it worked like a charm 