Sony Xperia Z has a 5″ 1080p display, featuring an incredibly high pixel density of 441 ppi. In order to power such a screen, the device features a 1.5 GHz quad-core Qualcomm Snapdragon S4 Pro processor, backed by the speedy Adreno 320 GPU. The Xperia Z also features 2 GB of RAM, 16 GB of internal storage, and a microSD card slot capable of taking up to 32 GB cards.
Sony has not rolled out the official Android 5.1.1 update for Xperia Z yet. However there are many custom ROMs available which will update Xperia Z to Android 5.1.1. Previously we saw how to install Euphoria ROM on Xperia Z. Now a build of OmniROM is also available. Follow the guide given below.