Android Update, News, Apps and Hacks

Galaxy S3 Jelly Bean Update: Try The Unofficial CM10 ROM


The custom development scene is currently alive with Jelly Bean Android 4.1 ROMs coming out for many devices, and even multiple ones for the same device. The international Galaxy S3 has already received quite a few Jelly Bean ROMs like CM10, LiquidSmooth, etc, giving users a taste of the latest Android version without having to wait for the official update from Samsung. The HTC One X, Galaxy S3’s direct competitor, has been receiving custom Jelly Bean ROMs at quite a fast pace as well.

Jelly Bean, as you might already know is the smoothest and fastest version of Android yet, with quite a few other features such as improved and actionable notifications, advanced voice recognition, offline voice typing, Google Now (which attempts to provide useful info without user intervention, such as traffic info), smarter keyboard, and quite a lot more. Having been recently released, manufacturers are yet to start rolling out Jelly Bean to their devices, which is where the custom ROMs come in, providing users with the latest and greatest version of Android in an unofficial capacity.

Now, an unofficial CyanogenMod 10 (CM10) based Jelly Bean ROM has been released by XDA Senior Member temasek, which features some added goodies baked into the official CM10 ROM, such as additional customization options, for an even better experience. The guide below will help you install this ROM on your Galaxy S3, with clear step-by-step instructions.

NOTE: Custom Jelly Bean development as well as CM10 are in their early stages, so expect bugs and issues to be present as well as things that might work properly. Since these are custom source-based ROMs and not official updates, problems are to be expected.

Let’s take a look at how the unofficial CM10 ROM can be installed on the Galaxy S3.


This hack and the guide below are compatible only and only with Galaxy S3, model number i9300. It’s not compatible with the US variants or other devices. Check your device’s model number in: Settings » About phone.


The methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know completely what it is. If any damage occurs to your device, we won’t be held liable.

How to Install CM10 on Galaxy S3


  1. Install the CM9 ROM on your S3 by following the guide → here. This step is important.
  2. [Skip if you already made a backup while installing CM9 in step 1] This procedure will wipe all your apps, data and settings (but it will NOT touch your SD cards, so don’t worry about those). Backup your Apps and important data — bookmarks, contacts, SMS, APNs (internet settings), etc. This Android backup guide would help you.
    Important! Don’t forget to at least make a backup of your APN settings, which you can restore later if your data connection does not work after installing the ROM. Use the backup guide to find out how.
  3. Download the latest version of the ROM from the official development page.
  4. Download the Google Apps package. This will install apps like Play Store, Gmail, etc. which are not present in the ROM by default.
    Download Gapps  |  Filename:
  5. Copy the downloaded zip files from step 3 and step 4 to the internal SD card (do not extract them, copy the zip files directly).
  6. Now, boot into ClockworkMod recovery. To do that, turn off your phone. Then, hold down Volume Up, Home and then the Power buttons together until the screen turns on, then let them go. The phone will boot into ClockworkMod recovery in a few seconds.
    In recovery, use the volume buttons to scroll up/down and the home button to select an option.
  7. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete.
  8. Select install zip from sdcard, then select choose zip from sdcard. Scroll to the ROM file on the SD card and select it. Confirm installation by selecting Yes – Install on the next screen. The ROM will start installing.
  9. After ROM installation completes, select choose zip from sdcard again, then select the file to install the Google apps package.
  10. After the ROM finishes installing, select go back then select reboot system now to reboot the phone into CM10.
  11. NOTE: To return back to a stock Samsung ROM, follow the guide here to do so.

CM10, based on Android 4.1 Jelly Bean is now installed and running on your Samsung Galaxy S3. Visit the official development page for more info and to get the latest updates on the ROM. Share your thoughts on the ROM in the comments.

  • Matthew Cooksey

    Accidentally wiped data and cache in stock recovery mode… cm10 is on internal storage.. is there a way I can load cm10 from internal in stock recovery mode? Odin does not detect my phone at this point is there any way I can get cwm onto the phone at this point or is it pretty much an expensive piece of plastic now?

    • scouseok

      if you wiped from stock recovery everything on internal memory has gone that includes CM10 i would download CM10 again and see if you can connect your S3 to you pc to place it on there and try flash it like that but i dont know if it will work for you

      • scouseok

        it is just an idea to try help you out

  • Shaun

    Since 3rd party apps cant write APN’s on Android 4+, the backup APN application you have listed in the guide does not work.

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