Step 5 In Flashtool, click the lightening button on the top left, select whether you want to run Flashmode or Fastboot mode.Flashmode is the one you’ll need most probably while you’re trying to install an ftf file, select it and press Ok.
If you want to root your phone, than you can follow the tutorial here.
Some of the people were complaining about battery drainage.
fter the leaked Sony Xperia Z firmware here I present to you the official Firmware from Sony.
People have been trying the leaked version and facing some bugs by some of them and not being even sure if all the function will be included in the final version.
Also check the settings in the Play Store so that automatic updates is not enabled as this may update Google Play Services again automatically.