Update Galaxy S2 I9100 and I9100G with Jelly Bean 4.3 Unofficial Firmware

Galaxy S2 I9100 and 9100G alike will have Android 4.3 Jelly Bean unofficial firmware when you are done with this guide.


However, to even begin the latter, you should start off by having a go at the requirements underneath:

  • root either your Galaxy S2 GT-I9100 or your GT-I9100G;
  • install a custom recovery image on your phone (there’s either TWRP or CWM Recovery you can opt for);
  • make a backup using this tutorial;
  • charge the battery unit of your smartphone;
  • open your phone and turn off those programs which protect it against viruses and such;
  • turn on USB Debugging (go to “Settings“, choose “Applications“, select Development and look for that option, then tick the box next to it);
  • open your notebook and do what you just did for the phone;
  • download Gapps archive from this location, for your I9100G (file name: cm-10.2-20130730-UNOFFICIAL-i9100g.zip) or (file name: jeboo_kernel_i9100_v1-2a.tar) on the laptop.

For this update tutorial we have to be grateful for the people behind the very popular and equally useful CyanogenMod.

The latter is well-known among users who have updated their devices with it; the various versions which have been thrown out there are all equipped with the exact features, apps and so on that will leave you very impressed with your tablet’s or phone’s general performance and so on. Galaxy-S2-I9100

On the side, you get to use your gadget for a longer time thanks to the fact that the battery as a whole is going to last more than it does now. The applications, options and what not are there to introduce you to many customization possibilities.

How to flash Android 4.3 on your Galaxy S2

But enough of that. Now’s the time to find out what you should do so that the upgrade firmware doesn’t encounter obstacles on the way to your Galaxy S2 I9100 or your I9100G.

  1. For the time being, concentrate on these guidelines: after downloading and making sure that the files in the pre-requisites are, indeed, on your laptop, you have to leave them unzipped.
  2. Once you are done, plug your handset to your notebook (the device’s USB cable is the appropriate tool we used for this task, so you need to use it, too). Now go to where the two zip files are; when you’ve reached the exact location, you will next have to do as follows: take them both from there and be sure to transfer them to the phone’s SD card.
  3. Unplug the two devices from one another and then make sure you download ROM Manager; this should be done if you notice problems when the device needs to be in Recovery Mode.
  4. By the way: to boot the phone into that mode, it’s best to power your device off, then press and hold Volume Up and Power at the same time. Another method to use for this action: go to the ROM Manager app and look for the Restart button; once you’ve spotted it, you need to choose it.
  5. Then wait for the Recovery Mode to be attained. Once you are sure it has been attained, you can proceed to the next guidelines telling you to opt for “Install zip from SD card” and then for the Android 4.3 package fit for your phone.
  6. [sc name=”banner-jos”]Now confirm, then install the Gapps package in the same way and don’t forget to confirm this, as well.
  7. After you have waited for about 6-8 minutes, you should do this: boot the phone in Normal Mode by choosing the Restart option once more. Your Galaxy S2 I9100 or the I9100G is now updated to the Android 4.3 Jelly Bean unofficial firmware. The place where this specific useful tool is: your handset’s About Phone.

Unfortunately, your phone may remain stuck in a boot loop. To turn this around, you should: long-press “Power” to switch the device off, then use the same button to turn it back on.