We are still waiting for the official Android 4.1.2 update for the Samsung Galaxy S2 that will probably come out in February, but the truth is that variants of this device as the S2 I9100G will have to wait much longer to see the arrival of Jelly Bean.

The Samsung Galaxy S2 I9100G is a model of the SGS 2 marketed by T-Mobile that has not Exynos processor, but a processor TI OMAP4430 dual-core 1.2GHz. It is for this hardware difference that international firmwares of the S2 won´t work on this phone.

Note: please note that during this process will erase most of your data, so it is advisable to perform a backup.

Update Samsung Galaxy S2 I9100G to Android 4.1.2 Jellybean

1 – The first thing we do is have root access on the Samsung Galaxy S2 I9100G and install ClockworkMod Recovery, which you can do by following this simple tutorial: Root Galaxy S2

2 – The next thing to do is download the ROM Avatar from here and Google Application pack from here.

After downloading the files, if you did it in the cell you must move them to the root of the device, it’ll need a file manager application, here is the link of some that I consider appropriate, they are all free with their links to Google Play:

If you downloaded with the PC move them to the root of the internal SD, also you can do it to the external SD if you have one.

If your computer does not recognize your device you might not have the latest drivers installed, for which I recommend you enter in the following post:

Tutorial: How to connect my Android to the PC?

3 – What we do then is start our device in recovery mode, for which we will (with the device off) press and hold the Volume UP + HOME + POWER, you can see how it’s done in the following tutorial:

Once in recovery we will move within the menu with the volume buttons to slide up and down and will select with the POWER button.

4 – The first thing to do is select “wipe data / factory reset“, we enter with the POWER button and select “YES – delete all user data” with the same button. Remember that for selecting this option you must go down with the VOLUME DOWN and VOLUME UP buttons.

5 – After a few minutes the process will complete, as in the previous step will do the same but with the option “wipe cache partition“, and select “YES – Wipe Cache” with the help of the volume buttons and entering with POWER.

6 – Then, also from the Recovery will enter in “advanced” and in this menu enter “Wipe Dalvik Cache“, as in the previous steps select “YES – Wipe Dalvik Cache” with the POWER button again.

Here’s a video and a post that explains how and what each one does, rest assured that you will not do any damage to your device (is in the Galaxy S3 but the processes are the same):


7 – Once you’ve done all three processes, without moving from the Recovery go to “install zip from sdcard” -> “choose zip from internal sdcard” and here will select the file “” you downloaded previously and install it by selecting “Yes – install” (will find it beneath everything along with the google apps package).

Note: if you have moved the files to the external SD should select “install zip from sdcard” -> “choose zip from sd card” (we decided to make the tutorial with the internal SD because all devices bring one with it, not the case of the external SD , but the process is the same and nothing will change)

8 – Once finished the process we will enter “install zip from sdcard” -> “choose zip from internal sdcard” and here will select the file “” which is the Google apps package and installed it by selectin “Yes – install“.

After completing these two installations will have to select “Reboot System Now” which is in first of the menus of the Recovery, if you’re not there select “+ + + + + Go Back + + + + +” until you find it.

Ready! When you start your device you should already have the ROM Avatar based on Android 4.1.2 Jelly Bean!


Leave your comment below and remember to subscribe to our YouTube channel and stay tuned for more videos!

Questions and doubt about terms used in tutorial? check this Android Dictionary or our Tutorial for Beginers.

Esteban Cejas

Puedes leer todos mis articulos desde aqui o seguirme en Google+ y Twitter desde @Esteban_strato para estar al tanto de todo lo que sucede en el mundo Android.