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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-z1-compact/
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 2014 Xperias
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
Hi, I see that KK is now available. Since I purchased my Z1 compact direct from Sony (therefore no carrier involved) I was hoping I could get this now. Any guidance on when it's available for unlocked UK users?
Many thanks
PM52
can somebody please help me out here? my phone is running kitkat 4.4.2 build version 14.3.A.0.757 which is not the latest version or build yet my phone says its up to date as well as when i plug into sony bridge to check. is there a way to force the update?