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Please read this if you considering unlocking the boot loader or rooting your phone.
Please note that you may void the warranty of your phone and/or any warranty from your operator if you unlock the boot loader. You should only unlock the boot loader of your phone if you are an advanced user with good knowledge of the technology and risks involved.
For more information go here http://unlockbootloader.sonymobile.com/
Please also note
The Sony Xperia support team will not be able provide any support, related to unlocking the boot loader or rooting your phone.
We also recommend you to read the below blogposts.
Sony Xperia support team
2014-07-21 12:34 AM
2014-08-26 11:04 PM
I'm currently on 4.1.1 release 3 on my xperia tablet s. I was curious if there were any new updates and came across this website showing how to root to kitkat 4.4.4. Is this real? I'm not finding any other info showing it's possible.
2014-09-18 07:39 AM
Rooting using Towelroot APK
Go to settings > Security > Mark "Unknown sources"
1) Download Towelroot APK
2) Install that APK. You will get a warning from your phone, just install the apk anyway, the app is just fine.
3) Run the app and tap on "Make it rain"
4) You have root now
Once it's done, you can uninstall the App from your phone, the root will remain so no worries.
2015-11-03 09:52 PM
I have unlocked the bootloader.
I have tried absolutely all methods, you have described, but I keep failing.
I have an Xperia Active St17i with Android 4.04 + version no. 4.1.B.0.587
What to do? Any suggestions?
2015-11-10 12:05 PM
Could you confirm once again if it's the ST17 " i " version and not the " a "
because if you got the " i " , then I can't understand why the process is failing.
I can only say that try on another PC. Make sure you have PC Companion installed.
If you get errors, give details here and only then I can try helping you with it
2016-03-13 11:15 AM - edited 2016-03-13 11:36 AM
hi guys im new to this i have a experia go (st27i) i installed pc companion and updated my phone to latest software/firmware the phone was ok at first but now it is very slow. it takes like 3-6 sec just to answer a call it takes ages to open whatsapp and facebook im loosing hope as i see sony cant help you to degrade to previous versions. What must i do to get the phone up and running smoothly again? flash or root it and if so explain to me please how to step by step.
i have android version 4.1.2