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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:

1. Download the desired Cyanogenmod

place it on your SDcard as ZIP file.

.

2. enable fastboot:

Download Files for Fastboot (the same as the Xperia arc)

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 (Don't turn on the device, just press Volume up and connect USB cable simultaneously. A blue light should come up, otherwise something has gone wrong).

5. Install the drivers for your device on your computer (from the drivers folder you downloaded)

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.

.

3. 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)

.

4. install boot.img:

1. Connect your device into fastboot again with Vol-Up While plugging in the USB-Cable
   fastboot devices
   (Seeing your serial number means we know all is good.)

2. Now type these commands:

   fastboot erase system -w
fastboot erase boot

3. then copy the boot.img in the same folder as fastboot.exe and type

   fastboot flash boot boot.img fastboot reboot

4. Now press the Vol-Down Button to enter the Recovery Mode again and install your image

.

5. Install Cyanogenmod in Recovery Mode:

1. Once the device boots into the ClockworkMod Recovery, use the physical volume buttons to move up and down. On most devices, the power button is used to confirm your selection, although for some devices the power button is used as a "back" button to go up one level, in which case the home button is used to confirm the selection.
   Optional/Recommended: Select backup and restore to create a backup of the current installation on the Xperia Ray.

2. Select the option to wipe data/factory reset.

3. Select Install zip from sdcard.

4. Select Choose zip from sdcard.

5. Select the CyanogenMod file you placed on the sdcard. You will then need to then confirm that you do wish to flash this file.

6. Install the Google Apps package as well

   Optional: Install any additional packages you wish using the same method.

Once the installation has finished, return back to the main menu, and select the reboot system now option. The Xperia Ray should now boot into CyanogenMod.

Whenever you want to re-enter the recovery-mode from now on (after installing ClockworkMod) you can always:

press the volume down key a few times when your phone boots up. The sony logo brightens at one point, press during that time

Although this should work, I am stuck with an error at the end: I Cannot install any Custom ROMs on Xperia Ray ST18i: assert failed: getprop Status 7