Android Update, News, Apps and Hacks

T-Mobile Galaxy S2 SGH-T989 Gets Jelly Bean Unofficially Via CyanogenMod 10 [Android 4.1]


The T-Mobile Galaxy S2 was graced with an unofficial semi-working Android 4.1 Jelly Bean ROM a few days back, and development on more and more Jelly Bean ROMs continues for the device, keeping it on equal footing with the international Galaxy S2 (which has also received a fair share of Jelly Bean based ROMs).

Jelly Bean is the fastest and smoothest version of Android yet, thanks to the ‘Project Butter’ enhancements. It also introduces advanced voice recognition, Google’s response to Apple’s Siri, along with other features such as offline voice typing, better and more useful notifications, faster stock browser, resizable widgets, Google Now (which attempts to provide useful info to the user without their intervention), and is currently making its way to devices unofficially.

Development team TeamChopsticks has released an unofficial CM10 Jelly Bean ROM for the T-Mobile Galaxy S2 built from CM10 sources, which brings Jelly Bean features along with the performance of CyanogenMod and its customization options to the device.

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.

Here’s the list of things working/issues in the ROM quoted from the development page (the most updated list can be found on the issues page here):

  • camera: Camera and Torch do not work at all
  • wifi: Clients cannot connect to wifi tethering if WPA is enabled.  Use Open for now.
  • lights: Capacitive lights may not come on if BLN is enabled
  • lights: If BLN is enabled, it may be disabled on the next reboot
  • radio: SMS longer than 160 characters will get split and not reassembled by the other side
  • radio: SMS messages sent too close together in time will not be sent
  • radio: “Use only 2G networks” option in Settings does not work
  • radio: Changing “Preferred network mode” in Settings does not work
  • radio: On Rogers, you may have no data without inputting your APN
  • radio: Contacts on SIM card are not accessible
  • radio: Changing call forwarding from this ROM is broken
  • peripherals: MTP mode does not work on Linux or Mac – stick with USB mass storage for now

Let’s take a look at how the unofficial CM10 ROM can be installed on the T-Mobile Galaxy S2 T989.


This ROM and the guide below are compatible only and only with the T-Mobile Galaxy S2, model number SGH-T989. It’s not compatible with any other device. 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 Unofficial CM10 ROM on T-Mobile Galaxy S2


  1. This procedure will wipe all your apps, data and settings. 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. [Important!] Install the ClockworkMod (CWM) Touch recovery on the phone by following the guide → here.
  3. Download the latest version of the ROM for Hercules (which is the T-Mobile Galaxy S2) from the official development page. Download the ROM only from the development page linked here.
  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. Download the recommended modem, which has to be flashed in order to make the ROM work.
    Download Modem  |  Filename:
  6. Copy the 3 zip files downloaded in steps 3, 4 and 5 to the internal SD card on the phone (do not extract them).
  7. 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. Phone will boot into CWM recovery.
  8. 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.
  9. Select install zip from sdcard, then select choose zip from sdcard. Scroll to the file and select it to install the recommended modem, confirming installation by selecting Yes on the next screen.
  10. After installation of the modem is complete, go back to the main recovery menu by selecting go back.
  11. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete (this will not erase your personal files on the SD card).
  12. 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.
  13. After ROM installation completes, select choose zip from sdcard again, then select the file to install the Google apps package.
  14. After gapps installation is complete, select mounts and storage, then select format /cache to format the cache partition. After format is complete, select go back then select reboot system now to reboot the phone and boot up into CM10. First boot will take up to 5-7 minutes.
  15. NOTE: 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.

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

  • mark

    Now i know this said only the sgh-t989 but could it also work on teluses t989d??

    • JC

      Yes it works. It’s virtually the same phone. I think only the case is different

  • bologs

    Camera stopped working after installation! Please help

    • Kyle von Hasseln

      its says on this page that loss of camera functionality is a known bug.

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