Update Galaxy S2 with Stunning Jellybean 4.2 Custom ROM Firmware

S2 New logoSamsung Galaxy S2 GT I9100 users now have a reason to feel pumped up as over a period of this article we will be guiding you on how you can accommodate the latest state of the art Android 4.2 firmware version right in your device. Though there are still no updates on by when there will be Jellybean 4.2 version of firmware will be rolling out officially by Samsung, the good thing is that developers are all here with the custom ROM firmwares which will help you apply this latest jellybean 4.2 firmwares with the help of custom ROM firmware called “Jellybam” firmware. Also, we have listed some of the brief features which this firmware comes with.

Key Features of Jellybam 4.2 Firmware for S2 GT I9100:

- Overall features of AOKP, CM10 and PARANOID -
- Custom JellyBam Settings with preferences -
- Tons of customizations -
- Themes and Mods in JellyBam style -
- Aroma installer -
- Latest CM10/AOKP vsync patched Kernel -
- Latest Siyah and DorimanX -
- Google apps from android 4.2 -
- New Mali driver -
- Exynos HWComposer -
- Lockscreen with x8 Custom app targets -
- Gallery, Camera and KeyBoard from 4.2 -
- Clock from android 4.2 -
- Google play music from android 4.2 -
- photo sphere and panorama works

Jellybam New

Express Pre Requisites:

  • All the data in your Galaxy S2 should be backed up with the help of below manual steps. Don’t backup with the help of KIES PC Tool as it won’t detect the custom ROM firmwares.

Note: Don’t backup the data with the help of ROM MANAGER as it may even brick the device for which we should not be held responsible for any damage.

SMS – Use “SMS Backup & Restore app”,
Contacts – Sync with the Gmail application,
Call Log - Call Log and Restore
Images, Songs, Videos, Files – Copy to internal / External SD Card,
APN and MMS Settings – Note down from the path “Applications > Settings > Wireless and Network > Mobile Networks > Access Point Names

  • Minimum battery level left in your phone should not fall below 30% so as to make sure that it doesn’t get turned Off in the middle of firmware update. From the path “Settings > Applications > Development > USB debugging”, enable the USB Debugging, ensure that the USB debugging option is ticked.
  • Download the Root Checker app from the Google PLAY Store and check whether your phone is rooted or not. If your device is not rooted, you will

How to Update Samsung Galaxy S2 GT I9100 with Official ICS 4.0.4 XWLPO Firmware

How to Root Galaxy S2 GT I9100 on ICS XWLPO 4.0.4 Firmware

Disclaimer: Follow all the instructions mentioned in this article as if there is any damage caused due to not following instructions then we shall not be held liable or responsible. Just in case if you face any issues then we will try our level best to address the same.

  • Please note that as of now it’s on the latest 4.1.2 Jellybean firmware but soon an OTA will power the device on the latest jellybean 4.2 firmware. But all the apps in this firmware are from Jellybean 4.2 firmware.

So as soon as the device is rooted and all the data in your device is backed up, you will now need to head over to the next step where we have summed up a detailed tutorial on how to apply this firmware update.


  1. I rooted my S2 witch is on 4.1.2, can i run this update or will it brick my phone or if possible loose root??

  2. I installed 4.1.2 successfully and everything works nice.
    but one problem.
    when i try to copy files to the phone or sd card using usb it gives a error for some files
    (even mp3)
    what is the solution?

  3. I confirme it’s only the 4.1.2 VERSION !!!!!!!!!!!!!

  4. I am on 4.0.3 with baseband I9100XXLPJ , Can I update to 4.2? And will I lose all the apps etc or will it just upgrade?

  5. hello , since i installed this Custom rom. i just want to know how to undo this ? or in other words i want to be back to Official ICS Firm of my SGS2 I9100 ? Please anser or Email me @asdfghjkloveyouaj@gmail.com. please ineed to know :DD

  6. Hey I bricked my phone by following the steps. Please help – it did not reboot successfully after installing the root package from the linked article!

  7. I tried updating my phone using cm10 kernel. while at 50% the phone got hanged and switched off. Later it dint get switched on. Took to the service center, they said i need to replace the motherboard. Now it costed me Rs 5500/-. Can you pls tell me where exactly i went wrong?

  8. incase we are not formating the sd card before upgradeis that a problem? It is taking more than 5 minutes for initial boot

  9. Being it my phone I’d try it, but I gotta ask first. If I come from a rooted stock GB firmware, will this not brick it? I am aware it might go in to a bootloop mid-flashing, because of the CWM and kernel :)

  10. “E: Can’t mount /sdcard/update.zip
    Installation aborted”

    That showed when I tried to “apply/sdcard/update.zip”

    I downloaded the .zip file and placed it in the device, but i tried to find the .zip file but i always seem to get the top message. What do I do?

  11. where would I place the .zip file?

  12. Where do you place the downloaded jellybam zip file?

  13. Where do you place the downloaded jellybam zip file?

  14. Hi guys, I am using this ROM and I think is just fine :). I have one issue though:


    Who can help???

  15. hello anyone plz help me in this plz

  16. I’m rooted. And still the same message:
    Validation signature failed.

  17. i updated this twice and both the time same error goole play stop, music beat stop, google voice stop what to do i cleared cache and wipe data and all but nothing works

  18. Why is GOOGLE PLAY MUSIC 0.00B?

  19. my phone is rooted but my rom does note support ota updates

  20. My current firmware is GT-I9100
    Android :- 4.0.4
    Baseband version
    Kernel Version
    SMP PREEMPT Wed Sep 19 18:31:23 KST 2012

  21. sorry typo error it show E: signature verification failed

  22. hi i m facing problem when i am going to do it from recover mode then my phone show me a error that w signature verification failed

  23. Installed this latest Jellybean rom – looks great, but phone audio is gone! had to revert to ICS. Same happened when I installed 4.1.1 Has anyone else experienced this issue? Also the back-button no longer works in any version of JB that I have tried.

  24. Sorry,don’t works,signature failed.
    I have samsung S 2 with os 4.04

  25. I am on 4.0.4 XWLPW firmware. Can I apply this update?

  26. I tried this ROM but ever since I installed it keeps saying, Google music play has stopped. And also the file managers cant access my external sd card contents. Any take on this?

  27. It did get me an error.
    E: signature validaton failed
    What is this?!
    Im runnig in ics 4.0.4 official and with custom rooted rom. SO?!
    Thanks and waitin’ for your answer.

  28. When will the update by released?

  29. Will I need to update my phone to 4.0.4 XWLPO Firmware before I update it to jelly bean 4.2?

  30. Download link for 4.1.2 gt_i9100

  31. Download link for 4.1.2

  32. My S2 don’t want to install zip from SDCard.Nothing hapened. Zip file did’t procesed. Boot again in 4.0.4

  33. Hi Pradeep,

    i tried installing the firmware but suddenly at 50% the phone got switched off. From then onwards it is not getting switched on at all. Pls help me

  34. Was on Android 4.1.2 Supernexus ROM by Faryaab [ROM][AOSP][JB][4.1.2][JZO54K] SuperNexus – I9100 – BUILD 5 [17-10-12], so I thought that I would try this 4.2 version. Unfortunately I was disappointed after down loading and installing a was not 4.2 but 4.1.2 again.
    I guess I will have to wait a little longer for the real 4.2 version.

    Vellamo results were favorable with HTML 1808 and Hardware 382 very impressive.

  35. hii…i am on CM10 experimental mod JB 4.1.1. its rooted.
    so can i directly update my s2 with dis rom? or i need to first update my cell with official 4.0.4 than proceed??

  36. Hi,
    I got one problem in my S2 GT I9100 that my device is not able to read
    and display ‘nepeli’ font, since I purchage this, so plz could you suggest me to how its possible
    to make displaying of my ‘nepeli’ font.

  37. How s the performance and noted any issues?

  38. I am on CM10 experjmental mod JB 4.1.1 and its rooted.can i update mg s2 wid dis rom without flashing into official android 4.04???

  39. So this is the latest jelly bam? does this also include photosphere functionality of 4.2?