How to Root Xperia Z3 and Z3 Compact with Locked Bootloader

Requirements:

• USB debugging enabled
  Settings => About phone => Click 7 times on Android Build to unlock developer options

• Allow mock locations
  Settings => Developer Settings

• adb drivers installed

• Firmware < October 2014 (kernel and system)

Steps to root Xperia Z3 and Z3 Compact with locked bootloaders using giefroot:

• Download the giefroot tool (latest version) and extract it

• Power on your device and plug it to your computer via USB cable

• Put your device in air plane mode

• Run install.bat and follow the onscreen instructions

• That's it. You should now be rooted and if you get an error "Device not rooted", try running the tool for a second time.