Update Galaxy S2 I9100 to UHMS9 Android 4.1.2 Jelly Bean Stock Firmware

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Galaxy S2 I9100 UHMS9 Android 4.1.2 firmware update is now available. This firmware can be downloaded from Samsung KIES for your Android phone, but no worries for those who can’t update because we already have a complete tutorial below for you on how to update manually. Don’t expect any new features in this I9100UHMS9 software update only brings some bug fixes to the latest Jelly Bean firmware on your phone. You can easily install UHMS9 Android 4.1.2 Jelly Bean on Galaxy S2 I9100 using the tutorial given below — and also root this firmware! This is not a modified or a custom ROM. It is an official firmware by Samsung that does not even require a custom recovery like ClockworkMod in order to flash the ROM zip file on your phone.

As you read further, we will guide you how to backup your important data, some other important tips and then tell you how to update Galaxy S2 I9100 to UHMS9 Android 4.1.2 Jelly Bean using ODIN. Please note, this is a branded firmware release which means you might find some extra language packs or apps in it, but you can install it on any Galaxy S2 I9100 (except in China, Hong Kong and Taiwan). A backup of your phone is highly recommended as you never know when something might go wrong. Also don’t forget to read all our important tips given below. The following tips are important as they will help the installation procedure to go smooth without any issues. Let’s continue with the tutorial below.

Galaxy S2 I9100 - UHMS9 Android 4.1.2

Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial ;-)

Android 4.1.2 UHMS9 Firmware Details:

PDA: I9100UHMS9
CSC: I9100TCEMS3
Version: 4.1.2

If you wonder why you should root Galaxy S2 I9100 or any other Android phone? Read: Benefits of Rooting Your Android Device.

ROOT TUTORIAL: If you want to root your Galaxy S2 I9100 on this latest Jelly Bean firmware, read this: How to Root UHMS9 Android 4.1.2 on Galaxy S2 I9100 Official Firmware.

UPDATE: The latest XWLSJ Android 4.1.2 firmware is now available for the Galaxy S2 I9100. Read the tutorial here!

Previous official Android 4.1.2 Jelly Bean firmware updates for Galaxy S2 I9100:

Android 4.1.2 for Galaxy S2 I9100 – New Features:

Here is a list of all the new features that this ROM comes with:

  • Buttery Smooth Performance & Great Stability (Thanks to Project Butter)
  • Full User Interface Revamp (Same UI as of the Galaxy S III and Galaxy Note II)
  • TouchWiz Nature UX
  • Samsung’s S Cloud services
  • New Lockscreen With Many Customization Options
  • New Features like Direct Call, Smart Stay and Pop-up Play
  • New Widgets (From Galaxy S III)
  • Free 50GB Dropbox Storage
  • 2 Home screen modes
  • New Notification bar With More Notification Toggles
  • Google Now

Samsung Galaxy S2 USB Drivers

You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for Samsung Galaxy S II properly. If not, you can download the latest official drivers from our Android USB Drivers section here:

Download Samsung Galaxy S II USB drivers!

Backup and Other Important Tips

Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:

Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:

Samsung users can also back up data using Samsung KIES. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.

If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up.

A few more optional tips that you should remember:

1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich and Jelly Bean.

2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?

4. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.

If you find the above tips useful and they were helpful to you, please consider giving us a +1 or LIKE to thank us!

All set and ready? Good. You can now head over to the next page and update Galaxy S2 I9100 to UHMS9 Android 4.1.2 Jelly Bean official stock firmware.


  • Solution wanted

    Phone is networked locked. How do i get rid of that?!

    • Xixo

      Did someone fix that? Cause i cant find the freaking solution!!

  • AFakePunditSays

    The Android 4.1.2 I9100UHMS9 firmware file doesn’t have any files with CODE, MODEM, CSC, or PIT within them.

  • AFakePunditSays

    Also, does it matter what baseband version my SGSII is prior to doing this procedure?

    • Solution wanted

      I’ve installed it with extracted file in PDA.. Jelly Bean up and running but its networked blocked so cant make phone calls!!

      • AFakePunditSays

        I think I’ll hold off on using this firmware then. Let me know if you find a solution.

  • AlsoAVictim

    No reaction yet on “Jelly Bean is up, but I can’t make any phone calls; network blocked” ? How can I reach my communication netywork with my prepaid phone? Thank you for replying!

  • http://www.facebook.com/eddynicolay Eddy Nicolay

    Works flawlessly. Amazing stuff. CheerZ