No technical stuff, just follow the steps and you will be rooted in no time.
I did this with:
android version 4.0.4
So the very first thing you should do is unlocking your bootloader. Sony has made their own tutorial on how to do this, but It can be a little complicated. Im gonna link you to it and to a videp which explains it very well. I prefer the video myself.
http://unlockbootloader.sonymobile.com/ and http://www.youtube.com/watch?v=0e1DYnoxUm0
After that you will need to unlock recovery mode. You can do this in 2 ways but I prefer the easy one.
The easy one is:
Installing a custom kernel with recovery mode integrated in it.
Use this link to download the kernel or go to the forum thread where I found it:
Now that you've got the kernel with recovery mode integrated downloaded, we need to flash/install it into the phone.
You need to do this via flashtool. That's atleast the easiest I think.
You can download flashtool from the following website:
Install it. If you have problems installing the drivers for flashtool, you can use this video http://www.youtube.com/watch?v=nOC57DfI1zo
Now you need to make sure your phone is on and connected to your pc.
Open flashtool and click on the thunderbolt in the upper left corner.
Select fastboot mode.
Now select "Reboot into fastboot mode (via ADB)"
Wait for it to reboot. There should be a blue light turned on, on your phone.
Now look at your pc screen again. Click on "Select Kernel To Flash"
Select the kernel that I Gave you in the beginning of the tutorial.
Wait for it to install and your mobile probably reboot etc. untill it is on.
Now download Superuser zip file : https://rapidshare.com/#!download|93...d.zip|1324|0|0
Place the Superuser zip file on your mobile phone memory card or internal memory.
Now Turn off your phone completely.
Now we are gonna go into recovery mode to install Superuser.
There are several ways to do this but the one I use is holding both the volume buttons down and then holding the power button aswell.
(I did this when my phone was connected from my pc) or you use this video (skip to 3:31)
It should boot into recovery mode. You can use the volume buttons to go up and down and the power button to select. Browse to the sdcard for the superuser.zip file and install it. (the most easy part).
Now go back to the start screen of recovery mode and select reboot into system.
Done, you have now got a fully rooted xperia T lt30p
Please tell me if I missed something. My first post ever lol
This post helped me alot: