Step 1 - Sony Xperia Arc S - Howto Root

Root the Sony Ericsson Arc S (LT18i) with Android 4.0.4 ICS (Official Firmware)

This tutorial is intended for Sony Ericsson Arc S smartphones with Locked Bootloader .

Follow the steps that are on this page to check if the Bootloader is locked or not .

http://unlockbootloader.sonymobile.com/instructions

First check if you have the the Sony PC Companion (USB Drivers) installed so that you can the smartphone the PC , if they are not download here

Now let´s begin the process :

1 - The USB debugging option must be Enabled ( Settings / Developer Options / USB debugging ).

2 - The smartphone battery should be at least 80 % -85 % .

3 - Backup the data you have on your smartphone, just in case something goes wrong .

4 - Download FlashTool for Xperia Arc S and install on your PC here

5 - Download DooMLoRD_v1_Xperia-2011-ICS-ROOT-emu-busybox-su to your PC and extract with Winrar for example here

6 - Now download the kernel Android 4.0.3 (LT18i_4.0.3_kernel.ftf) here and Android 4.0.4 (Lt18i_4.1.b.0.587_kernel) here

7 - Connect your smartphone to your computer

8 - Drag the Android kernel 4.0.3 into the folder " firmware " which is located inside the Flashtool folder (C :/ Flashtool / firmwares ), open the FlashTool and follow the steps as in the images below:

In the image below is the list of firmwares that are in the Flashtool , select LT18i_4.0.3_kernel what it says and then just push “Flash” and wait for it to be installed on the smartphone .

The smartphone will restarting during this process .

9 - The USB debugging option must be Enabled ( Settings / Developer Options / USB debugging ).

After the smartphone to be powered back on, do the following:

• Enable the “USB Debugging” (Settings / Developer Options / USB debugging)
• Enable the "Unknown Sources" (Menu\Settings\Security),
• Run the file " runme.bat " we extracted in step 5 . The smartphone will restart 2 or 3 times, as part of the process .

Full procedure output:

10 - Now this process is similar to the step 8 , we drag the Android 4.0.4 (Lt18i_4.1.b.0.587_kernel) to C:/Flashtool/firmwares and do the same thing that was done in step 8.

In the image below selects what it says Lt18i_4.1.b.0.587_kernel and then just push “Flash” and expect it to be installed on the smartphone.

The smartphone will restarting during this process .

11 - If all has gone well , you now have your Sony Ericsson Arc S with Root

If PC Companion asks you to update just ignore.

If you update your phone will go back to the original stock rom (no root, no clockwork mod)

Based On: http://crimo-blog.blogspot.pt/2013/02/como-fazer-root-no-sony-ericsson-arc.html#.Ui5FyPJdZzM

How Root and Install Custom Roms on Xperia Arc S

• Step 1 - Sony Xperia Arc S - Howto Root
• Step 2 - Sony Xperia Arc S - Howto Install Clockworkmod
• Step 3 - Sony Xperia Arc S - Howto Install a Custom Rom (clockworkmod)