Install CyanogenMod on Sony Xperia Arc S


Install CyanogenMod on Sony Xperia Arc S

Unlock your Xperia Arc

What does “unlocking” mean?

The first step in putting any custom operating system on your Xperia Arc is to unlock the bootloader. A bootloader is the very first program that runs when you turn on your device. The bootloader initializes some hardware and then loads the kernel and ramdisk, and gets the boot process going. If the bootloader is in locked mode, it will ensure that only the stock operating system can run. Since you will be installing your own operating system (CyanogenMod), you need to turn this off.

To unlock your bootloader, you’ll first need a program on your computer called adb. One way to get adb is to download and install the Android SDK (Software Developer Kit) from Google. The SDK is used by app developers when they’re writing programs for Android, and who knows, you may want to write apps someday.

Install the Android SDK

Download the SDK, per the steps on Google’s web page. Then install it by following the specific instructions for your computer.


Unlocking the bootloader on a Sony device may automatically wipe internal storage; a backup of the sdcard is suggested. It will also irreversibly erase the DRM keys stored in the TA partition of some devices, which will result in the loss of certain proprietary features that may have been included. Check your specific device forum on XDA to learn more.


In order to unlock the bootloader on your Xperia Arc you will need to obtain a code from Sony. The following process will help you acquire this code so that you can flash a custom recovery.

  1. Open the Phone application on the Xperia Arc and enter *#06# to obtain the device’s IMEI. Save this for later use.
    • Optional: if you do not have a phone app, the IMEI can be found on the box or on the device in About Device -> Status.
  2. Put the device into fastboot mode:
      1. Power down device
      2. Plug data cable into PC
      3. While holding down the Menu button, plug the data cable into the device

      If successful, the LED will turn blue to indicate the device is in fastboot mode.

  3. Open a terminal on the PC and enter fastboot getvar version
    • If you receive the message <waiting for device> fastboot is not configured properly, please see fastboot for more details.
  4. Navigate a browser here
    • Select your device and click the ‘continue’ button at the bottom of the page.
    • Enter your email address, agree to the terms and select ‘Submit’
    • Click the link from your email, enter your IMEI and continue
    • The unlock code should now appear, write this down for the next step.
  5. In the PC’s terminal, enter the following command: fastboot oem unlock 0xKEY
    • KEY corresponds to the unlock code you were given.

The Xperia Arc’s bootloader should now be unlocked.


Installing CyanogenMod on Sony Devices


  1. Download the CyanogenMod package for your device that you’d like to install to your computer (I recommend you to download from the list).
  2. Download 3rd party applications packages, like Google Apps which are necessary to download apps from Google Play (I recommend you to download cm10 gapps from the list).
  3. Extract boot.img from the zip to your computer, you will need this file for fastboot.
  4. Put the phone into fastboot mode:
    1. Power down device
    2. Plug data cable into PC
    3. While holding down the Menu button, plug the data cable into the device

    If successful, the LED will turn blue to indicate the device is in fastboot mode.

  5. Open a terminal on the PC and enter the following:
    • fastboot flash boot boot.img
    • fastboot reboot
    While the device reboots, press the Volume rockers a few times to load recovery.
  6. Once the device boots into ClockworkMod Recovery, use the physical volume buttons to move up and down. The power button is used to confirm your selection.
  7. Optional (Recommended): Select backup and restore to create a backup of your current ROM.
  8. Select wipe data/factory reset. If you get an error formatting /data, try format /data and /data/media from the mounts and storage menu
  9. You have two options for transferring and installing the installation packages. Both cases require adb to be working in recovery. The sideload method is more universal across devices, whereas the push and install method is more commonly used:
    • Sideload method: select install zip > install zip from sideload. Follow the on-screen notices to install the package. The installer does not necessarily display an “Install complete.” message. You can tell the install is complete if there were no fatal error messages and you have regained control over the menu.
    • Push and install method: Open a command prompt (or Terminal on Mac and Linux) and navigate to the directory holding the package(s) you would like to install. On the device, navigate to the mounts and storage menu. If you see /storage/sdcard0 as a mountable volume, go ahead and mount it. If you do not see this directory, then instead mount the /data directory. Take note of which volume you mounted. Now, push the package(s) to your device:
    – If you mounted /storage/sdcard0, then: adb push /storage/sdcard0/
    – If you mounted /data, then: adb push /sdcard/0/
    where should be replaced with the package filename. Go back to the main menu and select install zip. Choose to install from the same directory where you pushed the package(s). If you are installing multiple packages, install CyanogenMod first and then install any subsequent packages on top of it.
  10. Once installation has finished, return to the main menu and select reboot system now. The device will now boot into CyanogenMod.


On 2011 models, the kernel will not update when flashed in recovery, so the kernel must be updated via fastboot every time you flash a new build of CyanogenMod.

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