Sony is rolling out an update to the Xperia Z1, Xperia Z1 Ultra and Xperia Z1 Compact to fix a few sound issues that were introduced after the devices were updated to Android 4.4 KitKat back in March. The update carries build number 14.3.A.0.757, and the main issue it fixes is related to sounds from the handset being played through the internal speakers instead of the loudspeaker.
The update is rolling out to all variants of the three devices in quite a few European countries – it’s only available on Sony’s PC Companion program at the moment, though that should change in the next few hours. Hopefully, it won’t introduce any major new bugs while fixing existing ones, but that’s something we’ll only find out once the updated build has been put to use by consumers in the coming days.
Source: Xperia Blog