This is the method to Root Xperia Arc/Arc S running ICS Android 4.0.4. Please, Take note that I don't response any problem with ur phone. Anyway, I successfully n completely did it already. Firstly, U need to download these 5 files: A. Project Igi 1 Unlimited Edition Game Torrent on this page. Download Flashtool for Arc/Arc Sfrom here: B. The ready to root from here: For Arc S: or For Arc: C.

ADB driver for Arc/Arc S from here: D. Root file for Arc/Arc S from here: E. Kernel 4.0.4 only from here: For Arc S: or For Arc: After downloaded, let’s start to do follow the instructions bellow: I. Flash the ready to root 4.0.4 1. Install Flashtool from A.

Change the format file from “ ready to root.rar to. Sim City Update 1.1.638.0. RAR“ ( B) and it will become a winzrar file then U extract n copy it to C: Flashtool firmwares 3. Open Flashtool Application =>Click on Flash button =>Flashmode =>ok Make sure that u follow all the options as the picture below (Don’t tick any option on the right hand n choose lt18i/lt15i, 4.1.B.0.431, ready to root) (img:16777) 4. Wait a few seconds, it will pop up the message as the picture below. Then, U follow the instruction, it will automatically process n wait until complete 100%. (img:83408) 5.