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
2012-06-05 02:51 AM
How to "manually" update Xperia U ST25i 6.0.B.1.654 &/or debrand (other firmwares to come)
|HW Version||SW Version||Request Type||Date Certified|
|A||6.0.B.1.576||ECO||May 17, 2012|
|A||6.0.B.1.536||ECO||Apr 27, 2012|
|A||6.0.B.1.565||ECO||Apr 27, 2012|
|A||6.0.B.1.564||ECO||Apr 27, 2012|
|A||6.0.B.1.514||Variant||Apr 27, 2012|
as always thanx XDA forum
Rooting "might" void your warranty. I'm not responsible if anything happen to your phone (nothing should go wrong,, if something do go wrong, just repeat the whole process).
Solved! Go to Solution.
2012-06-05 02:53 AM
1st Backup everything
2nd follow the steps bellow to flash your phone (remember I'm not responsible if anything happen to your phone and this "might" void your warranty)
it's useful to have
How to backup Xperias
and the ftf files
Install it and you will see 5 folders
take the firmware to the "Firmwares" folder
click on Falsh
it will ask you to connect your phone on Flashmode (turn off your phone, press and hold Volume Down, then connect the USB) press OK
This is an step by step guide
2012-06-05 02:55 AM
How to backup Xperias
From sony mobile developers
Warning! If you perform this step, you will unlock the boot loader. This may void your warranty and/or any warranty from your operator. If you still want to unlock the boot loader of your phone, enter fastboot.exe -i 0x0fce oem unlock 0xKEY, where KEY is the unlock boot loader key you got in the beginning of this instruction. The boot loader should now be successfully unlocked.
from Sony mobile
Nor does this warranty cover any
failure of the Product due to accident, software or hardware
modification or adjustment, acts of God or damage resulting
For most issues/problems, unlocking the bootloader voids the warranty. Sony Mobile only honors the warranty if it is a known issue in that model/batch of phones or if it is an issue that clearly could not have been caused by flashing a different ROM. Because a new ROM can have a wide range of consequences (e.g., it can overheat the battery or change the voltage, which can damage other components), that basically means that only a small subset of issues are still covered by the warranty. Therefore, even when the phone is in warranty, the service center usually has to do a very costly board swap in order to get the phone back to its original state before it can perform any repair. The end-user has to pay for that part of the repair.
We are proud of providing the unlock feature to the developer community. Previously, there was a large risk of bricking the phone when unlocking with third party software. Sony Mobile’s solution remove’s that risk. When we initially provided the unlock feature, it was presumed that only highly skilled developers and super-users would take advantage of it. From blogs and discussion boards, it was clear that the community understood the risks and that unlocking largely voided the warranty. It appears that less sophisticated users (despite all our warnings) might be using the feature, and are now surprised by the consequences.
2012-06-05 02:56 AM
2012-06-05 02:57 AM
How to create a backup of your original firmware
2012-08-25 10:40 PM
1. its a pre-rooted .img NOT a .ftf file as said on the page
2. This is useless to those of us with locked bootloaders
thanks anyway but untill some actuall devs actually start working on this phone and that wont be untill ICS comes out which could be anytime, then for us with locked bootloaders this is useless APART from the debranding bit
2012-09-16 06:35 AM
i followed the steps but the flashtool shows a flash error could you help me ..??
i downloaded the 6.0.B.3.184 tft file and attempted the flash with the latest version of flashtool an ended up in flash error... am i doing something wrong?