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Just like any update there isn't an specific release date for each country/network
http://www.sonymobile.com/global-en/software/phones/xperia-l/
Latest available software
You may already have the latest software, depending on the date of purchase. Software updates are released at different times depending on operator and/or country. Therefore, we cannot give you an exact date for when a specific update will be available for your device.
If you can not wait for the update then you can manually update your phone to the latest firmware
How to manually update, downgrade, root 2013 Xperias
http://talk.sonymobile.com/thread/124152
If you encounter any bugs after the latest update, it is recommended to re-install the latest update
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
yes need to think before update but i have a bug in my xperia l (15.3.A.0.26 firmware) ambient light sensor. i found some time its not working after restart the phone its working properly. thats y i wating for new update. i think its software issue any suggestions guys......thankx
There is a new 15.3.A.1.14 firmware certified on PCTRB:
http://www.ptcrb.com/vendor/complete/view_complete_request_guest.cfm?modelid=22826
At the moment it seems to be available in:
Belgium - Generic BE
Phillipines - Generic PH
For which model has the rollout started . Is it for c2104 or for c2105 ? please frd clear it . Thanx
It's for C2105.
As far as I know it's not certified for C2104.
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To Sony Support:
Where is the Release Notes and/or bugfix list?
That's indeed bad news for c2104 users... 
And yes, could you please tell if it has solved the proximity sensor bug? Thanx.
I have absolutely no idea what's within this update.
I'm an ordinary customer who not even use an Xperia L myself. (My son has one).
It's a job for Sony Support to tell us about the update, but unfortunally they are in many ways worthless!
That's why we, users in the community, have to test the devices, do reversed engineering and guess what's going on.
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BTW, now 15.3.A.1.14 also available for:
Germany - Genericy DE
Indonesia - PT. Telatama artha mandari
Mena Arabic (b) - Generic MEA
Russia - Generic RU
Saudi Arabia - Generic SA
Taiwan - Generic TW
Thanks a lot man, keep us posted about this update
Thanks for the info ...