How to Root Xperia Arc S LT18A on Android 4.0.4 ICS Official Firmware

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We just wrote about how you can root Sony Ericsson Xperia Arc S LT18A on Android 4.0.3 ICS firmware. Now, we will tell you how to root your phone when on the official ICS Android 4.0.4 software version. You can root Xperia Arc S LT18A on Android 4.0.4 ICS with the easy tutorial below.

In this tutorial, we will tell you how to root Xperia Arc S LT18A on Android 4.0.4 ICS firmware with complete steps and instructions. Make sure you backup all your data as given in the tips below. Let’s get on with the tutorial now.

Disclaimer: All the tools, mods or ROMs mentioned below belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial ;-)

Make sure you have installed all your USB drivers for the Sony Ericsson Xperia Arc S to connect it with the computer. Download Sony Ericsson Xperia Arc S USB drivers! Apart from just the USB drivers, there are a few more things that you need to take care of.

1. You need to enable USB debugging mode. This helps to connect your Android phone with the PC. See here: How to Enable USB Debugging.

2. Your phone battery should be 80-85% charged. If your phone goes off suddenly because of battery, during flashing ROMs or installing mods and updates — your phone might go dead permanently. See here: How to Check Battery Percentage.

3. Backup all your important data that you might need as soon as your flash a new ROM, or make a backup for just in case, you never know when anything might go wrong. See below on how to backup data:

4. Your phone should be factory unlocked. Additional instructions for locked Android devices will be added in the tutorial for unlocking devices.

Now, let’s proceed with the tutorial below and root Xperia Arc S LT18A on Android 4.0.4 ICS firmware.

HOW TO: Root Xperia Arc S LT18A on Android 4.0.4 ICS with One-Click Root

We have put together a detailed step-by-step instructions guide on how to root Xperia Arc S LT18A on Android 4.0.4 ICS with One-Click Root. This is a very simple and easy-to-use tool available for the single-click root method.

Please read the complete tutorial before actually performing it.

Just To Remember:

  • This root method tutorial is only for Xperia Arc S LT18A and I am not sure if it will work on the other variants of the Xperia Arc S on other carriers.
  • Make a Nandroid (or any) backup of your previous phone set up before proceeding – for just in case anything goes wrong.
  • You should be already on Android 4.0.4 ICS firmware before performing this tutorial.

Complete Step-By-Step Instructions:

Step 1 - Download Flashtool for Xperia Arc S which will let you flash kernel and root your phone.

Step 2 - Download Root_Exploit_OneClick.zip to your computer and extract the zip file.

Step 3 - Now, download Android 4.0.3 kernel that we will use to root first and then install Android 4.0.4 firmware over it.

Step 4 - Connect your Xperia Arc S to your computer using the USB cable. Make sure USB debugging is ON as given on the first page.

Step 5 - Also make sure all USB drivers are properly installed for your phone.

Step 6 - Drag the Android 4.0.3 kernel to Flashtool and install it.

NOTE: After your phone is back ON, you might get errors and FC throughout your phone after flashing the Android 4.0.3 kernel, but not to worry. This will be fixed in the next step.

Step 7 - Then, go to the extracted files folder (in Step 2) and run the batch file ‘RunMe.bat‘.

NOTE: Your phone might restart 2-3 times during the process. It’s alright and there is no need to panic. It is part of the root process.

Step 8 - Now download Android 4.0.4 firmware to your computer.

Step 9 - Just check “exclude system” and “exclude baseband” options. Uncheck other options, including even the kernel option.

That’s it! Your Xperia Arc S LT18A should now be rooted on Android 4.0.4 ICS firmware (with an unlocked bootloader) installed on your phone! Check for the Superuser app in your apps list to verify.

To make sure you have correctly installed the above root method and it’s working, verify with Root Checker as given in the link.

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If you run into any problems, feel free to drop us a comment below and we will reply you back ASAP with the fix or the solution to your problem.


  • http://www.facebook.com/BrunoMGSantos Bruno Santos

    needs to be with unlocked bootloader before using these instructions ?

  • jjj

    é para marcar ou desmarcar a opção 9excluir do sistema e excluir base band

  • MrcS

    ” Step 3 – Now, download Android 4.0.3 kernel ”

    Broken Link……

  • Mauricio

    Hi, the link for downloading Android 4-0-3 Kernel is broken!