How to Install Xperia U ST25i official Ice Cream Firmware

This tutorial works for the Sony Xperia U ST25i and it works with rooted or unrooted phones without unlocking the boot loader.
Please consider that flashing a new firmware may void your warranty or damage your phone which is only your own responsibility.

For the Android 4.04 Ice Cream firmware I am using the official one, it is not a custom Rom but the official one that will be available through PC-Companion (but it is not the case yet), so if you cannot wait and you would like to try, read on.

Steps to install official ICS (Ice Cream Sandwich):
  • Back up your phone memory with PC-Companion
  • Uninstall PC-Companion (I had to do this so the tool would pick up the good drivers)
  • Enable USB debugging on your phone.
  • Donwload Flashtool and firmware (here is the full tutorial and download files: http://www.androidgadgematic.com/2012/10/install-android-4.0.4-ics-official-sony-u-st25i.html)
  • Install Flashtool and uncompress the firmware files.
  • Copy the firmware file XperiaU_ICS4.0.4_nu.ftf into the c:/Flashtool/firmwares folder
  • Turn off the phone and open Flashtool, click on the thunder button and on firmware selection choose the file XperiaU_ICS4.0.4_nu.ftf
  • Don't change anything and click the OK button.
  • Now press volume down and connect the phone at the same time to your pc with the USB cable.
  • The process starts automatically: keep the volume down key pressed all the time untill you see "Finished" in the log tool.
  • When it is finished disconnect the phone from your PC and turn it on.
  • The first boot may take some time.
Here are some pictures:
Chose the official firmware file:

Flash process starts automatically wait untill you see a good message like this:

It is a good idea to back up the memory because the flashing procedure wipes and deletes everything. When everything is done reinstall PC-Companion and recover your data you will be happy to find all your old messages, programs and configurations and connections and you start enjoying Ice Cream Sandwich on your Xperia U ST25i right away.
This firmware is debranded, no custom logo, nothing! Just the way I like it.

That's it, enjoy!

Comments

  1. Falgun BhagavatulaJanuary 23, 2013 at 12:43 PM

    i was trying to custom install cyanogen 9 and my phone got stuck..i thought i have to give my phone to sony centre and pay them to reset my phone..
    by followint the above steps i got my phone up and working as it was before...
    thanks a lot for providing the crucial information of repairing..

    ReplyDelete
  2. MariaJanuary 25, 2013 at 12:59 AM

    I'm glad for you. That's the magic of Android you can always flash, it is risky though..

    ReplyDelete

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