There is no change-log available right now, but speculation is that this firmware brings the fix for sudden death issue plaguing the Sony Xperia Z smartphone. Sony had earlier acknowledged the issue and had promised to bring a fix for the same at the earliest.
The update packs mainly big-fixes and there are no visible changes. Currently being released in Netherlands, it should reach other markets in the coming weeks.
- Android version: Remains at Android 4.1.2
- Kernel: 3.4.0
- Build number: 10.1.A.1.434
In related news, If the German arm of Sony is to be believed, Sony Xperia S Jelly Bean update is expected to be released later this month. The update will finally take this ICS running smartphone to Android 4.1.