May 30, 2014


Upgrade Galaxy S2 I9100 to XXMS7 Android 4.1.2 Official Firmware

Samsung is not going to bring Android 4.4 KitKat for Galaxy S2 I9100 but still Galaxy S2 users can easily install Android 4.4.2 KitKat with a custom ROM. This time Samsung Galaxy S2 I9100 received a new official firmware i.e. XXMS7 Android 4.1.2. This update is being pushed only to Poland region through Samsung KIES and OTA (over-the-air) update system. If you want to get this latest firmware on your Galaxy S2 I9100, then we have a complete guide on how to install XXMS7 Android 4.1.2 Jelly Bean on Galaxy S2 I9100 device. Please keep in mind that this is an Official Firmware, not a modified custom ROM. You can easily install XXMS7 Android 4.1.2 Jelly Bean on Galaxy S2 I9100 using our tutorial given below. I recommend you to read this article once before actually performing it on your device.

As you continue reading below, we will provide you all the necessary tips like How to Backup Android Devices before installing any official firmwares or custom roms and many more. We will install this official firmware by using ODIN which is the safe method to manually install a new firmware update on your phone.
But still we suggest you to backup your phone because you never know when something might go wrong.
Let's start the tutorial below for safe and successful installation.
Galaxy S2 I9100

Disclaimer: All the official firmwares, custom ROMs, software updates, themes, mods, tools, apps, or anything provided in our blog belongs to their respective developers. Most of the custom ROMs we are providing belongs to XDA Developers. We (iDroid Horizon) or the respective developers are not responsible if any of our tutorial damage or brick your device. However if you follow our instruction properly, we hope it would not bring you in trouble. If you face any problems with our tutorials, please comment below. We are sure that we can bring your device in original position.

Details about XXMS7 Android 4.1.2 Firmware:

Model: GT-I9100
Model name: GALAXY S II
Country: Poland
Version: Android 4.1.2
Changelist: 1155032
Build date: Mon, 22 Apr 2013 01:33:56 +0000
Product Code: XEO

Android USB Driver for Galaxy S2 I9100

You must have USB Driver installed in your Computer/Laptop to connect your Android Device. Please make sure you have installed it before flashing any ROMs or Firmware. If you don't have USB Driver from before, you can download the latest  official USB Driver from our Android USB Driver Section here:
Download Galaxy S2 USB Driver!

Backup and some important tips

Done with USB Driver? Good. Now here we go for some work that you must do before installing this firmware. Please follow the important points that you need to take care of, as we don’t want anyone losing their personal data or apps:
Backup your all important data and apps because during any installation of a new custom ROM or Official Firmware , your device will be wiped and cleaned with new operating system. Make a backup for just in case, you never know when anything might go wrong. Read below for some important tips on how to backup Android data in a easy process:
Samsung user can also backup data by using Official Sumsang Kies. If you backup data manually, you will get more options for what to choose from. You can also move your data to other Android devices from different manufacturers, i.e moving Samsung Galaxy S5 backup data to Google Nexus 10. 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.

Few more important things that you must remember before installing any custom ROMs or Official Firmwares:

  • You might face some problems in connecting your Android device to the computer. How to fix? -> You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich and KitKat.
  •  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?
  • Most of the tutorials and how-to guides on iDroid Horizon are for factory unlocked Android devices. We recommend NOT to try our guides if your device is locked to a carrier, unless we have specified the device model or carrier name.
If you find the above tips are helpful for you, please consider giving us a +1 or Like on our Facebook Fan Page to thank us!
All set and ready? Good. You can now proceed to the tutorial below and update Galaxy S2 I9100 to XXMS7 Android 4.1.2 Jelly Bean official stock firmware.

How to Install XXMS7 Android 4.1.2 Jelly Bean on Galaxy S2 I9100

We have put together all detailed step-by-step  guides on how to update Samsung Galaxy S2 to XXMS7 Android 4.1.2 Jelly Bean. If you are used to installing official updates through ODIN on Samsung Galaxy devices, then this should not be any different for you.
Please read every line carefully and make sure you read the entire tutorial once before actually performing it on your phone.

To Remember:
  1. This tutorial for installing XXMS7 Android 4.1.2 is only for Samsung Galaxy S2 I9100. Please don’t try this with other Android device.
  2. This is an official Samsung firmware, not a custom ROM or a modified firmware.
  3. Make sure you backup all your data in your phone before proceeding.
Rooting Warning: This is an official Android 4.1.2 build XXMS7 update for Galaxy S2 I9100, which means you will lose root after installing this update. You will again have to root Galaxy S2 to gain full system access and be able to install root apps again. We will post an article soon on How to Root Galaxy S2 I9100 Official Firmware. So stay tuned with us.

Entire Step-By-Step procedure:

Step 1 - Download Android 4.1.2 I9100XXMS7 for Galaxy S2 to your computer and extract the zip file.

Step 2 - Download ODIN v3.07 which will help you to install Android 4.1.2 on Samsung Galaxy S2 I9100.

Step 3 - Switch OFF your phone. Now go to Download Mode. How? Press and hold the Volume Down + Home buttons together, and then press the Power button till you see the construction Android robot and a triangle. Press Power again to confirm to enter into Download Mode.

Step 4 - Make sure you have your Galaxy S2 USB drivers installed on your computer.

Step 5 - Open ODIN on your computer. Connect your phone to your computer while your phone is in the Download Mode.

Step 6 - If your phone is connected successfully, one of the ID:COM boxes will turn yellow with the COM port number. This step might take some time.

Step 7 - Now select the files that you have to flash/install on your phone. These files are to be found from the extracted files in Step 1.
  • Click on ‘PDA’ and select file with ‘CODE’ in its name.
  • Click on ‘Phone’ and select file with ‘MODEM’ in its name. Ignore this step if there is no such file.
  • Click on ‘CSC’ and select file with CSC’ in its name. Ignore this step if there is no such file.
  • Click on ‘PIT’ and select the .pit file. Ignore this step if there is no such file.
Step 8 - In ODIN, check the Auto Reboot and F. Reset Time options. As for the Re-Partition option, check it ONLY if you selected a .PIT file in the above step.

Step 9 - Now click on the Start button in ODIN. Installation process will start and would take a few minutes to complete.

Step 10 - After the installation is completed, your phone will restart. After you see the home screen, unplug your phone from the computer.

That’s it. Your Samsung Galaxy S II has now been updated to Android 4.1.2 build XXMS7 software update. Go to Settings > About phone to verify what build have you installed.

Hit +1 or Like on Facebook to thank us!
If you run into any problems, feel free to drop us a comment below and we will reply you back ASAP with the fix or the solution to your problem.


  1. great it's worked ...
    but i can't connect with wifi...
    when i turned on wifi button it turns light green firt but then suddenly it turns grey (off) :(
    help me please

  2. i cannot find s2 firmwear.please help meeeeeee

  3. Me too unable to find the firmware for download