New software with firmware build 10.5.1.A.0.292 has been released for the older Xperia Z series. The update moves the build number from the current version (10.5.1.A.0.283) and as the small change in build number suggests, there are no tangible changes. It is likely therefore to be a bug fix update only. The update is currently live for select regions on the Xperia Z, Xperia ZR and Xperia Tablet Z. The Xperia ZL is still yet to receive the update.
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as confirmed by sony in below link When are getting Android 5.0 Lollipop for Sony Xperia ZR? http://blogs.sonymobile.com/2014/10/16/were-bringing-android-5-0-lollipop-to-the-entire-xperia-z-series/ You’ve probably seen Google unveil Android version 5.0; Lollipop… Since the initial reveal of the Android “L” Developer Preview, we’ve seen lots of questions on our upgrade roadmap about our plans – so, here goes… We’ll be making Sony Mobile’s Android “L” upgrade available for the entire premium Z series*: including Xperia Z, Xperia ZL, Xperia ZR, Xperia Tablet Z, Xperia Z1, Xperia Z1S, Xperia Z Ultra, Xperia Z1 Compact, Xperia Z2, Xperia Z2 Tablet, Xperia Z3, Xperia Z3v, Xperia Z3 Compact and Xperia Z3 Tablet Compact. Sony Z Ultra Google Play edition devices will be first up – we’ll be back with more details on that soon. We’ll start the upgrade at beginning of 2015 for the core Xperia Z3 and Xperia Z2 series – continuing thereafter for all remaining devices above. We’ve been working hard to bring this major update to as many of our Z Series devices as we can, as quickly as we can. We’re really excited about the new Sony features & functionality and the improvements we’ve made to the user experience – and we’ll be sharing more soon…
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