No more than a few weeks back, we talked about a video in which the Sony Xperia Z1, Z2 and Z3 were running an AOSP build of Android 5.0 Lollipop. It didn’t take long for them to deliver a device tree and the unified kernel that can be used to compile a ROM on your own build machines.
The provided source is enough to compile a ROM and boot it, but the ROM itself isn’t ready to become a daily driver. Some crucial things like RIL and camera were broken. XDA Recognized Developer and Contributor krabappel2548 focused on providing the most stable AOSP ROM for the Sony Xperia Z3, and in doing so, they managed to fix multiple software issues like WiFi, calls, and texting (sort of). While this ROM is still an early preview of how Android 5.0 will feel on the Sony Xperia Z3, it’s definitely a good start for the developers to get all the bugs sorted out.
The ROM is distributed as a collection of fastboot images, so be sure that you have your USB cable in close proximity. To flash it, follow the instructions provided in the thread and Android development page.