Android Update, News, Apps and Hacks

Official AT&T Galaxy S2 CyanogenMod 10 (CM10) Available


The official CyanogenMod 10 (CM10) ROM has been released for the AT&T Galaxy S2 (SGH-I777), which brings the features of Jelly Bean Android 4.1 – a smooth as butter interface, Google’s voice recognition helper called Google Now, a smarter keyboard, better accessibility, an improved and actionable notifications menu, and a lot of others – along with CyanogenMod’s proven performance and customization options.

NOTE: The ROM is a work in progress and very experimental and and has some major issues present, along with a few things that do not work properly. Also, do not expect to see many customization options of CyanogenMod to be present in the ROM right now as CM10 is in its early stages.

Here’s a list of issues quoted from the official development page:


  • Everything is broken until proven otherwise.
  • Known broken things include:
  • Mediascanner derps hard for many people, eating 100% CPU for eternity
  • Missing many CM10 features
  • NFC totally untested
  • Anything broken on I9100 will be a problem on I777 too
  • Screenshots are from I9100. I’m lazy, and I777 isn’t any different
  • Libsensors is missing, so no sensors. NONE. Maybe tomorrow.

Let’s take a look at how CM10 can be installed on the AT&T Galaxy S2.


This ROM and the guide below are compatible only and only with the AT&T Samsung Galaxy S2, model number i777. It’s not compatible with any other device and may render an incompatible device unusable. Check your device model 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 AT&T Galaxy S2


  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.
    NOTE: 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.
  2. Make sure you have ClockworkMod recovery/any custom recovery installed on your phone.
  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. Transfer the downloaded zip files from step 3 and step 4 to the internal SD card on the phone.
  6. Turn off the phone, then boot into recovery mode. For this, press and hold these 3 buttons together until the screen turns on: Volume UP + Volume Down + Power. Keep holding the buttons down till the screen flashes the 2nd time, then let them go. Phone will boot into CWM recovery.
    In recovery, use volume keys to scroll up and down between options and power/home key to select an option.
  7. Perform a Nandroid Backup of your existing ROM, so that you can always restore it from recovery if something does not work out with this rom. To perform a backup, select Backup and Restore –> On the next screen, select Backup again. Go back to main recovery menu after backup is complete.
  8. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete (this will only erase installed apps and settings, but will leave your personal SD card files intact).
  9. Now select install zip from sdcard, then select choose zip from sdcard. Scroll to the ROM file on the sdcard and select it. Confirm installation by selecting Yes – Install on the next screen. The ROM will start installing.
  10. After ROM installation completes, select choose zip from sdcard again, then select the file to install the Google apps package.
  11. After the installation is complete, select go back then select reboot system now to reboot the phone into CM10.
  12. Returning to Previous ROM: To go back to your previous ROM, boot into recovery (as given in step 6), select backup and restore then restore your previous ROM by selecting it from the list.

CM10, based on Jelly Bean Android 4.1 is now installed and running on your AT&T Galaxy S2 I777. Visit the official development page for updates and more info. Share your thoughts on the ROM in the comments below.

  • abcdefg android

    I flashed this rom on my galaxy S2 i777, seems pretty stable but google now is not working. I just have the same old google search at the top of my home screen. Any thoughts or did google now just work the first time once you flashed it. I did flash the newest version of Gapps afterwards as well. Thanks

  • Dain Petersen

    Any tips on updating OTA style?

  • Dain Petersen

    Far more stable than i could have dreamed. Love Google Now.

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