Flash Sony Xperia U ST25i Ice Cream Sandwich 4.0.4 Tested Firmware
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Flash Sony Xperia U ST25i Ice Cream Sandwich 4.0.4 Tested Firmware

You can use the firmware for flash or reset screen lock 100% tested.


Flash Sony Xperia U ST25i Ice Cream Sandwich 4.0.4 Tested Firmware

As each phone brand uses its own OS proprietary protocols, there isn’t a program works for all kind of android phone. The Sony Xperia Flashtool tries to address the Xperia devices from Sony. This program also allows you to perform bootloader unlock which isn’t very common with flashing tools like this. Furthermore, it supports all the major Operating System variations. You can find Sony flashtool Flasher in download area bellow.

Xperia Flashtool allows you to flash files onto S1 devices which range from Sony Xperia X10 to the latest xperia android phone. The most popular usage of this flashtool is to flash FTF (Flash Tool Firmwares) onto compatible devices that you download using Original firmware or a custom one. Situations where you might find this tool handy includes when you are trying to update your device to a new firmware or are stuck in a bootloop or just to remove phone locks. The Sony Xperia Flashtool allows you some extra benefits as well. We will be discussing them all right below. Also, below, you will be able to find the latest versions of Sony Flash Tool available to download for Windows (XP, 7, 8, 8.1,10), Linux and Mac.

You can download FTF from XperiaFirm unclouded inside Sony Xperia Flashtool. The software itself connects directly with the servers and lets you view all the available firmwares. You can download the latest software or just google it if you can't find the right Version for your phone.

For drivers you find the necessary Sony drivers (fastboot, S1 Flashmode for each sony model, Adb) in the path folders C:\Flashtool\Drivers, install common drivers & the specific driver for your Sony smartphone you want to work on it, you will find a tutorial to how install drivers in download area.

Doing any operation (flash, update, hard reset) is totally safe but you need to read changelog of the software updates because sometimes there is bugs appear declared by the Xperia team.

Remarque: 
If you need to remove any kind of locks in the Sony Xperia Set, you are not oblige to flash the hole system, just you need to flash userdata partition and ignore uncheck all other partitions in order to hard reset your phone safely.

Pre-requiste:
1-This is for Sony Xperia only.
2-Your device must have 80 percent of battery.
3-You need a Laptop or PC to perform this Action.
4-Download the right firmware for your Xperia device from the link bellow.
Back Up your Data to make sure you have data’s in case if something Wrong (This Process won’t loose your data)
5-Make sure you have followed the steps properly. Don’t Skip and Read!
6-We are not responsible for any damage that you make to your Phone

Why you need to flash or factory reset Sony Xperia?
You need this firmware/stock rom if you have encountered this kind of problem in your Smartphone Listed Below:
1-Your Set Freeze and system applications stop suddenly (system crashing).
2-phone remains on Sony Logo and reboot itself.
3-bootloap and dead boot after a wrong software
4-Xperia full of viruses and bad apps; you need to flash it in order to terminate these malwares
5-You insert a pass code and you forgot it (all locks will be removed by this method, except Frp Factory Reset Protection will remain active after a hard reset or flash).

INFO:
Mobile : Xperia U
Model : ST25i
System Version : Ice Cream Sandwich 4.0.4
Baseband : 6.1.1.B.1.54


DOWNLOAD AREA:
Firmware download link:
Xperia U ST25i: From Here 

Latest Flashtool Download Link: From Here 

Fellow Video Tutorial How To Use Sony Flasher:
⧭⧭⧭⧭

HOW TO FLASH:

1- Install drivers for your Sony Xperia
You need to ensure that your PC has all of the necessary drivers installed for your Sony Xperia device. The best way to do this is to install Sony PC Companion.
Make sure you connect your Xperia to the PC before starting the process to download the necessary USB and ADB drivers. The best way to do this is to power off your Sony Xperia and then connect to your PC whilst holding the volume down button.

2-Install Flashtool
A-Download and install Flashtool from the official website (link above in download area)

B-Install Flashtool drivers from the following location: ‘C:\Flashtool\drivers’
Tick the “Flashmode Drivers” and “Fastboot Drivers” and driver for your device to install.

3-firmware download and location
A-copy firmware.ftf (firmware.ftf download link in download area) and paste it in ‘‘Firmwares” folder (following location 'C:\Documents\Firmwares’ for newest flashtool versions.

B-For old flashtool versions Download the file and place it in ‘‘Firmwares” folder that is is in Flashtool folder.

4-flash FTF firmware file
A-First of all, open Flashtool and then click on the lightning bolt in the top left of Flashtool as highlighted below.


Select “Flashmode” and click “OK”.



If you want to retain your apps, data and media (photos, videos, music), then ensure that the “USERDATA” option within the “Wipe” pane is unticked. However, we recommend that when upgrading a major new Android version, a clean install is the way to go. In this case, tick all options under the “Wipe” pane. This will wipe all of your data though including your photos and videos, so please ensure you have these backed up elsewhere. 

If you want to reset screen lock, then ensure that "USERDATA" option within the "Wipe" pane is ticked.



Click “Flash”. Flashtool will then indicate that it is “preparing files for flashing”.


You may have to wait around 60 seconds for the pop-up below to appear. Once it does, you should now connect your Sony Xperia device. Make sure the device is powered off and then hold the ‘volume down’ button whilst connecting the USB cable. Once the pop-up disappears and flashing has started, you can let go of the ‘volume down’ button.




Flashtool will then start flashing your Xperia device.


Once you see “Flashing finished” as indicated below, your Sony Xperia has been successfully flashed.



Congratulations you have just installed Android 4/5/6/7/OS! Now disconnect your Xperia device and power on the handset. Don’t worry if it takes a while for the handset to boot, this is to be expected.

Enjoy.

                                      
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