How to Root Xperia J ST26i, ST26a 4.12 JB 11.2.A.0.31 Firmware

Rooting an Android phone gives its user the supreme rights over the phone. A rooted phone has control over every system file stored on the device. It means that one can modify these files to make the phone look better and perform faster. There are countless possibilities for a rooted phone. There are number of applications available for rooted phones which can make the device work in a completely different and amazing manner.

Sony Xperia J’s latest official update is Android 4.1.2 Jelly Bean. Its build number is 11.2.A.0.31 or 11.2.A.0.21. This version of Xperia J with model number ST26i and ST26a can be rooted on locked bootloader. Rooting on locked bootloader has number of advantages. A locked bootloader can be restored to completely stock state and warranty might be restored. The TA partition can also be stored before unlocking the bootloader. The TA partition can be used whenever the bootloader is to be locked again.

The rooting method being used for Xperia J in this guide is Doomlord’s rooting toolkit. It is a one click rooting solution and ut requires PC for working. Therefore users must take care of installation of all necessary USB drivers and set them up properly. Follow the guide given below to root Xperia J 11.2.A.0.31 firmware.

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Install USB Drivers

Some of the operations given below will require USB drivers to be installed on the computer. It is necessary to establish successful connection between mobile device and computer. Download flashtool from here and install it. Locate the installation folder and open Drivers folder inside it. Execute the drivers installer. Select flashmode, fastboot and Xperia J specific drivers. Finish the installation. After installation is complete, connect the device to complete the drivers installation. It will also show if the drivers installed properly or not.

Install ADB and Fastboot

These tools will be required for both unlocking the bootloader and during the installation of this custom ROM. Fastboot mode is used in almost every Android device. It is used to issue some commands for installation of kernels, recoveries and other things. You can choose between two ADB and Fastboot tools given below. First one is the complete install guide with all the tools while Minimal ADB and Fastboot is a faster and lighter alternative. It can be installed in about 10 seconds and consumes only ~2 MB space. Choose one from below and complete the installation.

ADB and Fastboot Guide for Installation

Minimal ADB and Fastboot Installer

Note: Use Windows 7 instead of Windows 8 or 8.1.

Phone Must Be Updated to latest 4.1.2 Firmware

If users try to install this custom ROM over an older firmware, then it might cause issues like loss of Wifi connectivity. Therefore, users must update their current firmwares. It also shows that you must not install this custom ROM over any other custom ROM, if installed. It should be installed over the stock ROM. A clean install is always better.

Make Backups

Making backups of data is important if you ever want to recover the device to an older state. If above mentioned steps are followed, the phone must be rooted and custom recovery must be installed. To make a backup of all application with data, follow this guide. To make a backup of calls and messages, follow this guide. To make a backup of full ROM, that is the current OS, use this guide. Using a Nandroid backup, a device can be restored to a previous working state. It is a full restore. Other backup options work as porting data from one ROM to another.

As an Xperia user, you must make a backup of TA partition, even if not unlocking the bootloader. Use this guide to make a backup of TA partition on Xperia J. (This step is for after rooting is done!)

It goes without saying that the phone must be charged over 50% to avoid all the interruptions. The phone must not turn off during the installation or it can damage the device.


Remember that all processes like rooting, flashing and manual updating are custom methods. They have no concern with Google or mobile manufacturer. Follow every step carefully to avoid any mishap. Owner of site will not be held responsible in case of any mishap. Do it at your own risk. Rooting and flashing custom ROMs will also void warranty.

How to Root Xperia J 4.1.2 Jelly Bean 11.2.A.0.31 FIrmware

  • Download Rooting Toolkit v17
  • Extract the rooting tool completely anywhere on the PC
  • Now turn on phone and go to Settings>Security and enable Unknown Sources
  • After this, turn on USB Debugging in Settings>Developer Options
  • Now connect the phone to PC using USB cable
  • If you are using any other Android device and it is connected to PC, disconnect it immediately
  • If there is an Android emulator, like Bluestacks running in background, close it as well
  • Now go to the folder where extracted files are
  • Execute Runme.bat
  • Now just follow the on-screen instructions
  • The entire process is handled by the script itself
  • Just keep following whatever appears on the screen onwards
  • That’s all! Enjoy Rooted Xperia J!

Got any question? Ask me in the comments below

Apps for PC +Hayder Ameen is a Computer Science student and Android is his passion. Other than that, he is a gym addict and a great sportsman. Connect with Hayder on Facebook and Twitter Email: Site: WhatsApp For PC

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