As already many of us know that we can use the Easy root toolkit to root our Xperia .402 Fw without the need to Downgrade.
I am making this thread as many have been asking me the steps to do it.
I am not responsible in any way if something goes bad. I have personally rooted 2 phones using this method and everything is fine.
Head over to this Post and download the V10.0 from there.
Follow the Steps mentioned below.
1. Download the attachment and extract it
2. Download http://towelroot.com/ and put tr.apk inside folder /files
3. Start your phone and plug it to your computer
4. Run install.bat and follow the instructions on screen
Now extra steps that I did.
After phone restarts download rootchecker from playstore and check if root is there.
It would show you the root.
Now Download the attached superuser.apk ( Dont install from Playstore )
Install it and open and it would ask you to update binaries do that ( Normal way )
Restart the phone.
Now my phone is Rooted with Locked Bootloader.
geohot: Root exploit
MohammadAG: Disable RIC kernel module (Link)
cubeundcube: Disable RIC on Z2 phone (findricaddr/writekmem)
[NUT]: Great guy and used some of his scripts as base
DooMLoRD: Used his idea of hacking chargemon
All the Devs who have worked hard for us !!!