Root Sony Xperia Z อ้างอิงจากเวปนี้ครับ http://forum.xda-developers.com/showthread.php?s=f20a8dd388dcd2937ae472525c955010&t=2327472

[ how to root ] 

1. just download the file, extract it completely using winzip/winrar
2. go to the folder where its extracted and execute "RUNME.bat"
3. read and follow the instructions on the screen!
4. REBOOT THE DEVICE AFTER THE SCRIPT HAS FINISHED EXECUTION!

ใช้ไฟนี้ในการ root  Easy rooting toolkit (v16.0)

                    created by DooMLoRD
                    "pref_event exploit"
    Credits go to all those involved in making this possible!
---------------------------------------------------------------
   Special thanks to: the_laser, Bin4ry, fi01, hiikezoe, [NUT]
  and to all those who are contributing to our git tree!
       Sources: https://github.com/android-rooting-tools
---------------------------------------------------------------
[*] This script will:
      (1) root ur device 
      (2) install Busybox
      (3) install SU files
  
[*] Before u begin:   
      (1) make sure u have installed adb drivers for ur device
      (2) enable "USB DEBUGGING" 
            from (Menu\Settings\Applications\Development)
      (3) enable "UNKNOWN SOURCES"
            from (Menu\Settings\Applications)
      (4) [OPTIONAL] increase screen timeout to 10 minutes
      (5) connect USB cable to PHONE and then connect to PC

DooMLoRD_Easy-Rooting-Toolkit_v16_perf-event-exploit.zip

Enabling Developers Options on Android 4.2

http://droidviews.com/2013/how-to-enable-developer-optionsusb-debugging-mode-on-devices-with-android-4-2-jelly-bean/

ให้เข้าไปที่ การตั้งค่า บนโทรศัพท์หรือ แท็ปเล็ต

หลังจากนั้น เลื่อนลงมาจนถึง เกี่ยวกับโทรศัพท์  หรือ ABOUT 

หลังจากนั้น เลื่อนมาที่  Build number  แล้วแตะเจ็ดครั้ง หลังจากนั้นจะปรากฏข้อความ “You are now a developer!”  
กลับไปที่ การตั้งค่า ก็จะเห็น Developer Options

Open Settings on your Android phone or tablet.

Scroll down to About and tap it.

If you have a Samsung Galaxy S4 or any other variant of the phone, open Settings> More tab> About and tap it.

Now scroll to Build number and tap it 7  times.

After tapping the Build Number 7 times, you will see a message “You are now a developer!” If you have a Galaxy S4 or any other Samsung Galaxy device with Android 4.2, the message reads as follows- “Developer mode has been enabled”.

Return to the main Settings menu and now you’ll be able to see Developer Options.

Tap on Developer options and mark the box in front of  USB Debugging  to enable it.

To disable Developer Options and USB Debugging mode later, follow the same steps and uncheck the box in front of USB Debugging.