Xperia Z2 is this years flagship device by Sony. It has some of the best specifications. It has a 5.2” 1080p full-HD triluminos display, Qualcomm Snapdragon 801 Quad-core 2.3 GHz Krait 400 processor, 20 MP camera and the latest Android KitKat 4.4.2.
Xperia Z2 was announced in February 2014. Although released very recently, the developers have been able to unlock the bootloader of the Xperia Z2. Follow the instructions given below.