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Update Galaxy S2 to Jelly Bean 4.1.2 with RootBox Custom ROM

The new Android 4.1.2 update is out so the third party devs can now start developing Jelly Bean custom ROMs based on the latest version of the Android system. Such an update was already developed and it’s available for the Samsung Galaxy S2 GT I9100 handset. Therefore, we will be checking in how to install the RootBox firmware on your SGS2 and update the same to Jelly Bean 4.1.2 OS. As usual, you have the installation procedure explained and detailed during a complex step by step guide, from which you can find all the info related to this new upgrade.

This is not an official software provided by Samsung for your S2; furthermore there are no words about an Android 4.1.2 OTA update for the same device. This means that the present ROM might be the perfect opportunity for those who are looking forward in improving the phone’s internal system with new features and capabilities. More, the Root Box firmware was developed and tested by those of xda-developers so we have them to thanks for this tutorial. Now, before starting the basic installation operation, you need to read all the following lines.

The first thing you must do is to make sure that you are taking the best decision. There are numerous Jelly Bean updates suitable for your Galaxy S2, so why to flash this one? Well, its main advantage is that the RootBox is being based on the latest version of the Android platform, the 4.1.2 one. Then, there are the features which will be installed on your smartphone. I have displayed the most important ones in the image from below. Take a look and then decide whether to apply this tutorial or not.

Jelly Bean 4.1.2 RootBox Features for SGS2

Jelly Bean 4.1.2 RootBox Features for SGS2

As mentioned, we are dealing with a custom ROM and not with an official one. This means that by flashing the same, you will lose your SGS2 warranty. This is happening because the Jelly Bean 4.1.2 RootBox software will run only on a rooted handset. So, you must gain root access first; and with this the warranty will get void. For restoring the same, you should downgrade to the stock ROM (the latest official update which was released by Samsung for your S2), or just wait for a new official upgrade to be launched. Also, for being able to apply the update file on your smartphone, you must get and install a custom recovery image, like CWM recovery on your device.

Another important aspect is referring to your data. You must know that first of all, the system has to be wiped out. This operation can be performed by using the CWM recovery, but more about this during the proper steps. Anyway, you should backup the SGS2 data, contacts, messages, market apps, calendar info, the current Rom, the EFS folder and anything else you need to. For that you have suitable backup and restore guides here, on Android.gs; just search through our how to section and use the tutorials from there.

Finally, you need to ensure that you can use a Windows running computer with internet connection enabled, you S2 and its USB cord. Then, on the PC and smartphone deactivate the security tools and the antivirus and Firewall protection. On your device, the USB debugging option must be checked; if not go here and enable the same “Settings -> Applications -> Development -> USB debugging”. On the phone SD card there should be at least 1GB of free space. The handset must have enough battery life (at least 70%) for being sure that it doesn’t get turned off in the middle of the operation. Don’t perform this method for installing the Jelly Bean 4.1.2 update on a different device from the Samsung Galaxy S2 model number GT I9100 as you can end up in bricking it.

How to Update Galaxy S2 GT I9100 to Jelly Bean 4.1.2 with RootBox Custom ROM Firmware

  1. Download the update file from here.
  2. Download the Google Apps package from here as it is not include in the update.
  3. Save the files on your computer.
  4. Then, connect the phone with the PC.
  5. And copy the downloaded files on your phone SD card.
  6. Disconnect the device by removing the USB cord.
  7. Turn off and enter the S2 in recovery mode.
  8. The recovery mode for the SGS2 can be reached by pressing on the Volume Up button and on the Home key button while pressing on the Power one.
  9. From recovery, use the menu and select “wipe data factory reset” and “wipe cache partition” (remember to backup the data first).
  10. Up next, after returning to recovery (+++go back+++) select “install zip from sd card” and “choose zip from sd card”.
  11. Take the update file first from the SD card, flash it and then redo the up-mentioned step for installing the Google Apps package too.
  12. In the end, when all the processes are finished, select “+++go back+++” and “reboot system now”.

There you have it guys; you now know how to manually update the Samsung Galaxy S2 with the Jelly Bean 4.1.2 based RootBox custom ROM firmware. The installation operation wasn’t hard to complete, though there are many pre requisites to take care first. Anyway, no test the new ROM and then share your opinions with us and with other users who might want to apply the update too. Also, stay close as we are bringing new how to guides daily.

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