Rooting 4.0.2.A.0.62 (stock Android 2.3.4 firmware)

Rooting an Xperia Arc S running on 4.0.2.A.0.62 is a little more complicated, as it requires you to downgrade your firmware first to stock firmware 4.0.2.A.0.42 using a Generic Global, and not region specific firmware.

1. Downgrade to stock firmware 4.0.2.A.0.42 Generic Global.
   1. Download the LT18i 4.0.2.A.0.42 Generic Global FTF (Xperia Arc (LT18i)_4.0.2.A.0.42_CE.rar, size: 155.17 MB).
   2. Download Flashtool 0.6.9.1 to your computer and install it according to these instructions.
      • For Windows users (MD5: 9E6AEAA286FC145FDEBD65F6CC492585):Mirror 1 | Mirror 2
      • For Linux users (MD5: 0BB12562F21B5291F34CD06272EB10F5): Mirror 1 |Mirror 2
   3. Before you continue, you’ll need to disable your computer’s antivirus software as it interrupts the tool.
   4. Flash the LT18i 4.0.2.A.0.42 Generic Global FTF using Flashtool 0.6.9.1.
2. Root the phone using DooMLoRD’s Easy Rooting Toolkit.
   1. Download DooMLoRD’s Easy Rooting Toolkit (DooMLoRD_v4_ROOT-zergRush-busybox-su.zip) to your computer.
   2. Extract the file using 7-Zip, WinRAR, or other similar file extraction programs.
   3. Extracting the file should give you the runme.bat file.
   4. Connect your Xperia Arc S to your computer via the USB cable.
   5. On your computer, double click on the runme.bat file to launch it.
   6. Follow the instructions on the screen.
3. Perform OTA upgrade for 4.0.2.A.0.62.
   • Do not use the PC Companion to upgrade back to firmware 4.0.2.A.0.62, otherwise root will be lost.

Your Xperia Arc S should now be rooted. You can now continue to installing ClockworkMod Recovery on your Xperia Arc S.