Sony, where is the update which was supposed to be rolled on 7th April?
Sony Mobile statement on Android 4.4 KitKat sound bug
“Sony Mobile Communications would like to provide an update in response to reports around abnormal audio functionality and quality; that some users may be experiencing on their Xperia Z1, Xperia Z Ultra and Xperia Z1 Compact devices after upgrading to Android 4.4 KitKat. We have identified this issue on some units of these models, and measures have been taken to swiftly deliver a solution for our users. A fix for the issues will be included in a new software release that will start rolling out from next week (w/c 7/04)
, with exact availability and timing varying by operator and market.”