Complete Beginners Guide To Root Samsung Galaxy S2 In Ubuntu Linux

How to root Samsung Galaxy S2 on Ubuntu

You might think it is a bit late to write on how to root Samsung Galaxy S2 in Ubuntu Linux because its been over 3 years since its release and there are already Samsung Galaxy S3 and S4 in market. But it was only recently when I decided to root my Samsung Galaxy S2 after my contract with SFR was over. At least now I won’t be violating the warranty from the manufacturer as its over 2 years now for my phone.

The other reason why I am writing this article on rooting Android phone is that I did not find any good articles that could teach a beginner to easily root an Android smartphone on Linux. I followed the steps mentioned on XDA forum, but I felt the need of improving the article with clear steps and proper screenshots and hence I came up with this article to show you how to root Samsung Galaxy S2 easily in Ubuntu Linux.

How to root Samsung Galaxy S2 in Ubuntu Linux

The tutorial was performed on Elementary OS Luna and Samsung Galaxy S2 I9100 running on Jelly Beans (Android 4.2.1). But these steps are generic and with a little modification, can be followed on any other Linux distribution and any other Smartphone with any other Android version.

Prerequisites:

Here are some of the prerequisites to root an Android phone on Ubuntu:

  • A USB data cable to connect your phone to computer
  • A computer running any standard Linux OS with internet connection (to download some files, mentioned later).

The procedure may seem a bit long to you, but trust me, it is not. Its really easy to root your Android phone and it won’t take you more than 10-15 minutes to follow the complete procedure. Steps are detailed so that even a beginner can easily root the phone.

Step 1: Find the Kernel version on your phone

First thing first. You need to find which Kernel version your smartphone is currently running. On your phone, go to Settings-> About phone. Look closely for Build number.

On Android: Settings->About phone-> Build number

Know the Android Kernel version

As you can see in the picture above, the build number for my Samsung Galaxy S2 is I9100XWLSD. Notice the LSD. This is important to download the correct “rooted Kernel” image for your phone.

Step 2: Download the rooted Kernel image

Once you have got the Kernel number, its time to download the rooted Kernel image (thanks to XDA developers). For XWLSD, download Siyah-s2-v6.0b4.tar file.

Download Siyah-s2-v6.0b4.tar

For other Kernel versions, please check on XDA developer forum or search on Google. Its not possible for me to provide the links for each of them.

Step 3: Extract the downloaded Kernel image

Once you have downloaded the tar file, extract it. The extracted file would be zImage. Copy it to your home directory (for simplicity purposes).

Step 4: Download and install Heimdall

Heimdall is a cross platform Open Source tool that is able to flash firmware on Samsung devices. You can download Heimdall form their repository. Reposiory has a number of files for different Linux distributions. Basically, you have to download the command line (heimdall) and front-end (heimdall-frontend) files for your Linux OS.

For Ubuntu and other Debian based distributions, you can see the .deb binaries there. Download and install the one for your Ubuntu version.

Install heimdall in Ubuntu to root your android phone

Alternatively, you can also try to compile the source code.

Step 5: Put your phone in Download mode

Once you have the correct rooted Kernel image and Heimdall installed on your Linux system, its time to start the rooting process. For this purpose, you have to put your phone in “download mode”. Try the following steps:

  • Switch your phone off
  • Hold the power key+volume down+ home key

Download mode for Samsung Galaxy S2

You’ll see a warning message after few seconds on the screen. Press volume up button to continue in “download mode”.

Root Samsung Galaxy S2 on Linux

Once you are in downloaded mode, you shall see a screen like this on your Android phone:

How to Root Samsung Galaxy S2 on Linux

Step 6: Connect the phone to computer

In the download mode, connect your phone to the computer using a USB data cable. To check if it is well detected by your Linux OS, open a terminal (Ctrl+Alt+T) and use the following command:

heimdall detect

This should show you a result like “device detected“:

Root Samsung Galaxy with heimdall

Step 7: Flash the Kernel

Now is the time to replace your old Kernel with the rooted one. In the terminal, use the following command:

sudo heimdall flash --KERNEL zImage

It will be a long output. If its a success you will see the following lines at the end of the long message:

Uploading KERNEL
100%
KERNEL upload successful
Ending Session....
Rebooting Device....
Re-attaching kernel driver....

Note.

If it was not successful for some reason, you should see the message at the bottom of the log. In the first try, I saw this error message: ERROR: Partition “kernel” does not exist in the specified PIT. When I checked with sudo heimdall print-pit –verbose command, I found that there were several partition on my phone and the Kernel was on partition KERNEL and not kernel (case sensitive, you see).

Your phone will be logged in automatically.

Step 8: Check if your Android phone is rooted

Al right, it was a success for you so far. But how to verify if your phone is rooted? For this download a terminal app on your Android phone. I used Android Terminal Emulator. It is like a Linux terminal in your Android phone. Start the app and write the following command in the terminal and press enter key.

su

If you are rooted, it will prompt you like this to ask for root access:

super user root access check in android

Once you give the root access, the $su will change in #su. An indicator that you have root access now and it also means that you have successfully rooted your Galaxy S2.

I hope this guide helps you to root your Samsung Galaxy S2 in Linux. Feel free to drop your suggestions, feedback, thanks and questions in the comment box below. Subscribe to the blog for more tutorials. Ciao :)

  • T959P

    Any chance you’d be able to write a HOWTO specifically for the Galaxy S Fascinate? I’m having unreal amounts of trouble with this one.

    • http://www.computerandyou.net/ Abhishek Prakash

      Unfortunately, I do not have access to Galaxy S. No one in my friend circle use this model. And I cannot write an article without actually trying the steps myself before writing it.
      I would suggest to check XDA forum for it.

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  • Adel Mohamed

    Can I use the same steps for my Alcatel 985D dual ?! :D

    • http://www.computerandyou.net/ Abhishek Prakash

      You have to get the the Kernel Image for your model and build. Apart from that, rest of the procedure remains the same.

  • nury

    hi, i try to root my s3 mini but i got the error: ERROR: Failed to open file “zImage”… what can i do??? :(

    • http://www.computerandyou.net/ Abhishek Prakash

      Make sure that the file you have downloaded and extracted is named zImage and also make sure that you have given the correct path to this file.

      • nury

        How can i know if i the path os correct??? The only filr with extension “image” is boot.image… and the other file (when i extract the link) is just meta-inf… when i try to open boot i got thr samr error: (… im new using linux and also rooting xD…
        Thanks

        • http://www.computerandyou.net/ Abhishek Prakash

          I had wrote this: “The extracted file would be zImage. Copy it to your home directory (for simplicity purposes).”

          Go to the downloaded folder where you have extracted it. Copy the zImage file and paste it in your “home” directory and then run that command.

  • Bad Luck

    I did this and got no luck! My phone is dead. I can get it in downloadmode but when I repet the procedure I get no booting!

    • http://www.computerandyou.net/ Abhishek Prakash

      What procedure? A little detail please.

  • rooooooted

    Fascinating… simply baffled!

    • http://www.computerandyou.net/ Abhishek Prakash

      Welcome :)

  • toni

    i’ve no luck:( my phone is dead… it wont boot up and i can’t get it in download mode..:( can someone help me??

  • francesco

    thank you so much! very helpful and clear” and easy!

  • coder94

    Hi Abhiskek, i tried this .. the kernel uploaded successfully but it got stuck on the boot screen with the samsung logo and model number. Please help me !!!

  • galxS2

    MY Build Number is showing I9100XWLST. What Should I do. Do i need to follow this or not???