Sony Xperia U ST25i Flash Tool & Official ICS 4.0.4 Firmware Update

Update Sony Xperia U ST25i to Official ICS 4.0.4 Firmware [6.1.1.B.1.54] Download Free

Sony Xperia U ST25i Flash Tool & Official ICS 4.0.4 Firmware Update

Sony launched a new series of Xperia. Few of them were
high-end devices (Xperia S, Xperia ion), some were middle-range phones (Xperia Sola, Xperia U, Xperia P) & rest was low-end devices (Xperia Tipo, Xperia Go). All these devices were launched with Gingerbread 2.3.7 onboard (Xperia Tipo is exceptional). After a month or two, Sony rolled out ICS update for its flagship devices & subsequently for middle-range devices. As we all know that they've taken a bit long time to release ICS updates, it may not be tolerable. But anyway, finally, it's out.
Sony started upgrading Xperia U ST25i to ICS on September12. At first, they rolled out 6.1.1.B.1.10
firmware for all the devices. Now by fixing the bugs & issues like random lag & resource management, they've pushed another ICS update with 6.1.1.B.1.54 firmware for India region. But with Flashtool (firmware flashing tool for all Xperia), you can apply it to any unbranded / unlocked Xperia U worldwide

Android 4.0.4 ICS update has improved performance stability over Gingerbread. Along with that many interesting
features like face unlock are also added.
 ICS was one of the revolutionary updates from
 Google & Sony has taken it to a higher level.
In this article, we are going to discuss how you can 
upgrade your Sony Xperia U ST25i to 
6.1.1.B.1.54 ICS 4.0.4 firmware.
Disclaimer: Steps given in this article are risky can cause damage to your device. You should not try to
attempt these things if you are unaware of it. 
Please follow this guide completely at your own risk.
 We won’t be held responsible if you damage 
 you're device while following this guide.

 his guide must be applied only on Sony Xperia U ST25i. 
Don't try to implement it on Xperia P /
 Xperia Sola or on any other device
 else it can turn in hardware failure of your device.

Charge your phone at least up to a 75% battery level.
It is highly recommended to backup all your data from
internal memory (includes contacts, messages (SMS/MMS), 
call logs, Internet APNs, etc.). 
Your phone data will get lost after installation of this firmware
 (excluding External storage).

  • Download the Xperia Flash tool from here.
  •  Well, be using it for flashing the firmware.
  • Download Xperia U ST25i Official Android 4.0.4 
  • ICS Firmware package (6.1.1.B.1.54) from here.
  1. Update 1 (6.1.1B.1.89): Download (Don’t extract)
  2. Update 2 (6.1.1.B.1.100): Download
  • Install Flash tool that you’ve just downloaded
  •  on your computer. For the sake of convenience,
  •  install it in the root directory of C: drive.
  • Extract ICS firmware package, 
  • you’ll get ST25i_4.0.4_Indian Firmware.ftf file on your extracted location.
  • Navigate to C: –> Flash tool –
  • Firmware's and delete all the data over there if anything is present.
  • Now move ST25i_4.0.4_Indian 
  • Firmware.ftf file in the above-mentioned directory.
  • Open Xperia Flashtool. 
  • Select Flash option (Black Bolt icon)
  •  from the top left corner of the tool 
  • (Refer to the image given below).
    It will ask you to select either Flashmode or Fastboot mode. Select Flashmode proceed
  • further by hitting the OK button.

  • On next screen, Firmware selection
  •  window will appear. On left side, 
  • select ST25i (version 6.1.1.B.1.54 / .89 / .100).
  • On the right side of the tool, tick 
  • following 4 options 
  • (Caution! Don't tick any 
  • other option than 4 mentioned below).
  1. Wipe data.
  2. Wipe cache.
  3. Wipe apps log.
  4. No final verification.
  • Press OK. Wait for the Flash tool to prepare firmware installation.
  • Now, it will ask you to connect your phone. Before you connect your phone to the computer, enter into Flash mode on it. To do so, switch off the phone completely. By holding Volume down key, connect it to PC. If done correctly, you should see a green light on the power.
  • After establishing a proper connection with the computer, the flashing process will start. The firmware installation process may get stuck around 93%, which is normal. It stays there for 20-30 seconds and not more than that.
  • Once you get Flashing finished message in Flash tool, remove your phone from PC & wait for it to reboot (It may take more time than usual for booting the device, which is normal. So don’t get panic & be patient).
That's it! You have successfully updated Xperia U ST25i to Android 4.0.4 ICS firmware. Now in case if you need any help while flashing firmware, do comment below. Well, try our best to sort out the same.

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