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I followed this instructions

I downloaded

Eroot 1.3.4: Link

stopped all applications and started the eroot program

clicked on "-Root"

waited the 4 steps and there it was. (don't press again the "Root" button, that will remove root again)

you can check with Root Checker if you have root access, click on "Verify Root Access"

If you have root access you can install cyanogenmod 9.1 stable release shown in the following steps:

.

enable fastboot:

Download Files for Fastboot

1. Extract the file to a new folder naming say Unlock.(Do it neatly as you wont get confused while entering into CMD).

2. Go to unlockbootloader.sonyericsson.com (We will do the unlocking in the official way).

3. Read the instructions carefully and click Continue/Proceed whatever they ask,note down ye IMEI (The place where the website ask to paste it,enter in exactly first 14 digits,not 15digits) and after submitting ye Name, IMEI and mail click Submit and note down the code they produce(Copy that in a notepad).

4. Enter in fastboot mode(Press Volume up and connect USB cable simultaneously and blue light should come up,otherwise something has gone wrong).

5. Install the drivers for your device from the drivers folder

6. Go to fastboot directory and Ctrl+Shift+Right Click (or on Windows 7 open a CMD shell end go into the fastboot directory)

7. Type in fastboot.exe -i 0x0fce getvar version and hit enter

8. Type in
   fastboot.exe -i 0x0fce oem unlock 0x<your_code>
   (use directly by your code that you have already copied in notepad) and hit Enter

You are done. When you start your Phone you will have fresh factory reset Android. 1: http://androidtweak.in/downloads/xperia/unlock_xperia_arc_bootloader.zip

install ClockworkMod:

1. Install x-Parts from Google Play.

2. After installation, open the app and select the Installs tab.

3. Select Install CWM and follow on-screen instructions.

4. You can Reboot into the Recovery mode from there (press the button in the Tools Tab)