Sony has released a new compilation of Android 4.3 Operating System for Sony Xperia Z1 and Sony Xperia Z Ultra smartphones. New firmware is known as build number 14.2.A.1.136 and except bug fixes has also a few improvements included:
14.2.A.1.136 firmware changelog:
?Display personalisation, including ability to alter White Balance
?Clearer music streaming using Bluetooth devices
?Optimised Wi-Fi performance & stability
?Enhanced Email experience
?Contacts, Messaging and Small apps improvements.
Firmware will be available via Sony Update Service, PC Companion and Over The Air. In this thread you can share with us your opinions about new firmware for Xperia Z1 and Xperia Z Ultra 
Source: Sony
