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Procedure to Upgrade Galaxy S2 GT I9100 firmware with Official Jellybean 4.1.2 Firmware:
- Download the Complete Official Jellybean 4.1.2 Package (Alternate Link) from here to your computer to extract the same. Once extracted, open odin in your computer and turn Off your device so that it can be entered in the download mode.
- Download mode in Galaxy S II GT I9100 can be entered by pressing Volume down Key, Center button, and holding both simultaneously press the Power Button after which a green robot will be shown indicating the Download Mode has been entered.
- Open Odin in your computer. Connect your device to the computer with the help of original USB cable and then you will see that the ID : COM Section will turn Yellow.
Note: If ID : COM section doesn’t turn Yellow, you need to check with two things which are mentioned below,
- Install the USB Drivers in your computer &
- Go to the Path “Settings > Wireless & Network > USB Settings” and ensure that “Samsung KIES” option is ticked before connecting the phone to the computer.
- Now, click on the below mentioned options to select the appropriate files.
PDA – CODE_I9100XXLSJ
Phone – MODEM_I9100XXLS6
CSC – CSC_HOME_OXX_I9100OXXLS1
- Once you have selected all the files, you will need to click on “Start” to start the process of firmware update. It will take around 4 -5 minutes for applying the update and once the update process is over, the device will be rebooted automatically.
- Once the device restarts, the phone will show up the home screen and all you need to do is to just follow the on screen instructions for starting the device. To check on whether the firmware has been successfully updated or not, head over to the path “Settings > About Phone” where the current firmware will be mentioned as Jellybean 4.1.2. Very soon we will be coming out with an article which will help you root the device.
Note: Just in a rare case if the device doesn’t boot up or show the home screen then remove the battery and reinsert the same to boot the device again in the normal mode.
Do let us know in the comments section below just in case if you face any issues as we will be more than happy to help you out. Congratulations, you have now successfully updated your Galaxy S2 GT I9100 device with the latest firmware update of Jellybean 4.1.2.
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contacts,settings,maps,music player takes 3+ seconds to open after clicking the icons
games like temple run & subway surfers hangs while playing
why is this happening ??
plz reply ASAP
otherwise nice update
try clearing the cache from recovery mode and the same will be fixed
Pradeep,
I had updated my phone wid this firmware few months back.But since the official update has been released recently for S2 , how do i go back and update my device with the official release?
Chandan Singh
Hazem haEm
Hi since the update texting has been hell. I can no longer add words to the dictionary. Also next word prediction is still anoying me. Can you please help with these two problems.
Many thanks
Hi Neela,
Kindly let us know when i can update the galaxy s2, GT9100 to jelly bean via kies
Regards,
Prashanth. K
Once the update arrives, you can apply the same
I have ICS 4.0.4 on my SGS2 9100. Few days ago, I wanted to make JB update to offical 4.1.2 as described in text. But I have big problem in installing via Odin. Com field doesn’t turn yellow and suggested solving option doesn’t exsist in Settings on my S2. Process fails with hour lasting message Downloading… on phone screen. Please help, because two of my friends also have same problem !!
Wi-Fi is not working in my set just after the OS upgrad to Jelly Bean? Can you please help me out of this.
Wi Fi bug has been fixed.. just try again…
Hey pradeep….aftr updating I m getting a problem….wen evr I opn gallery it says no external sd available….plz help!!!!!
successfully working on 4.1.2 XXLSJ
looking awesome interface no issue
but when connect through kies
its not working
plz help
Is there anyone who can help me with this problem which I am facing since the time to updated my phone. Every time I swipe between screens the phone reads it back to me. eg: screen 1 of 5, screen 2 of 5 and so on. I have to off the media volume to avoid hearing it. Please help.
Hmm…. crash sometimes…..
Does anyone facing problems with samsung keyboard? I had a problem to fill a number collumn.. the keyboard will just freeze.. and got error msg “Unfortunately, samsung keyboard has stopped”
Can sum1 respon to this problems..?
Download link not woking!! Please help
kindly check the same now
The updates worked perfectly for me…but I did it for a friend and he’s having problem with wifi.plz help me out…Neela
Awesome.. but some bugs in lock
And in keyboard handwriting option also.. thats it
Guyz can you put an article for Samsung Galaxy Ace plus – Jellybean?
And guyz who are updating firmware, Please create a different dropbox account to get that 50GB space. i signed in using the existing same account with which i already have 25GB for my HTC one X and so lost that 50GB thingy
eeekkk… just wanted to update all… ignore my above comments. 50 GB added to my account for 24 months
and now i have 75 GB of space…. 
Guyz, Amazing work as usual. keep it up. Works perfectly. Finally into official firmware again after your first upgrade 2.3.4 i guess for my S2 from 2.3.2
HTC one X is still stock though. Few hours back, received an update for jelly bean and somehow that’s not this good 
You guyz rock. Cheers!
Hi Pradip,
I have installed it but my device getting hot whenever i am using it.
hi guys thanks its working nice and have got 50gb drobbox no need to buy s3.thanks again
Hi, I am still facing the issue of screen talking back on every swipe. Also the there is lag and battery drains out very fast..Please help or else let me know how do I go back to ICS
follow the corresponding instructions to update the same
dude i downloaded the file but i get only 1 file
I9100Jellybean4.1.2_Samsung