Just yesterday, the Sony Xperia Z1 began receiving a somewhat unexpected update to software version 14.4.A.0.133. Building on the previous 14.4.A.0.108 release, which itself already brought the device up to the latest Android 4.4.4 release. However, the update still rolled out, starting in several European countries such as Germany, the Netherlands, Spain, Greece, and Poland.

Now, just one day after this latest .133 build started making its way out to consumer devices, Sony has uploaded the GPL-mandated kernel source code to Sony Developer World. News of this was originally announced via the Sony Developer World Twitter account, and this expedient release is nothing but good news for kernel and ROM developers on the device.

We still don't have a solid changelog for the update, but both the update and the open source files are now available for those who wish to give it a go. You can get in on the open source files for 14.4.A.0.133 by heading over to the Developer World pageAnd if you've not yet installed the latest 14.4.A.0.133 FTF onto your device, you can head over to the Xperia Z1 FTF Mega Collection firmware thread to get in on the latest update.

[Many thanks to Portal Supporter Titokhan for the tip!]