How To Install Android 4.0.4 ICS On Xperia arco S via CM9


Update your Xperia arco S to Android 4.0.4 ICS with the help of custom ROM CM9. This custom firmware is superior than official firmware. CM9 not only save your internal memory but also battery savvy. With CM9 custom ROM you will enjoy various customization of CyanogenMod including customized power option, sound control and many more. Its one of the best Android 4.0.4 ICS (Ice Cream Sandwich) based custom ROM out there for Xperia arco S. The bloatware free and battery savvy CM9 going to be a long runner. You can easily install CM9 (aka CyanogenMod 9) on your Xperia arco S once you install custom recovery such as CWM recovery.



This tutorial is only for Xperia arco S. Don’t try this guide on any other Android device. Also, we (PrimeHowTo) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.

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Pre Requisites:

1. It’s advisable to backup your data prior flashing. I recommend app Helium for this purpose, however you can use any other preferred backup app. [General Guide]


2. Make sure your device have enough battery power (at least 50% battery power) to avoid any accidental brick. You can install an app like Battery Notifier BT Free on your Android device to check it easily.

3. You must have USB Driver Installed for Xperia arco S in your PC. If you manage to access your phone data after connecting to your computer then you already have USB driver installed. [Download Driver Manually]

4. Make sure USB Debugging is enabled otherwise it’s won’t be possible to transfer file between PC and Xperia arco S. By default its enabled, so you don’t have to worry. [General Guide]

5. Your device must have latest available custom recovery installed. [General Guide]

Hope, you already checked all pre-requisites. It’s time to follow the step-by-step guide on how to install Android 4.0.4 ICS based CM9 ROM (nightly build) on Xperia arco S.

File Required(Download by clicking on it)

  1. CM9 Nightly For Xperia arco S [Filename:]
  2. Google Apps [Filename:]

How to Install Android 4.0.4 ICS based CM9 (nightly build) ROM on Xperia arco S

  1. Transfer downloaded file to your Android device by connecting to PC. Make sure you copied all files on SD Card (avoid coping within folder). Important: Don’t extract any files.
  2. Disconnect your device from computer and then turn off your Xperia arco S.
  3. Boot into recovery mode. To do so,  reboot phone and press back button few times while booting. [use volume buttons to scroll and Power button to select].
    1. You can also try: How To Boot Into Recovery Without Key Combination
  4. First of all create an image of your existing OS by performing Nandroid backup of your existing ROM which you can restore later if this new ROM don’t perform the way you want or if there any glitch. To do so, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
  5. Now, perform data wiping task. To perform this, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping. Perform this step 3 times to avoid any bootloop issue.
  6. Select install zip from sdcard, then select choose zip from sdcard. Now, locate the CM9 Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install on the next screen. The ROM installation will begin.
  7. Once the ROM installation process end, repeat the Step 6 but choose the file instead of ROM zip to install the Google apps package.
  8. When installation is completed, perform the Step 4 one more time and then go back to the main recovery menu and select reboot system now to reboot your Xperia arco S and boot into Android 4.0.4 ICS ROM CM9.
  9. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

That’s it! You just learned how to update your Xperia arco S to Android 4.0.4 ICS custom firmware using CM9. Explore the latest Android 4.0.4 ICS based CM9 ROM. [Note: You may require a rooted device to enjoy all CyanogenMod features]