Galaxy S II

How To Root Samsung Galaxy S2 i777 with Gingerbread 2.3.5 Firmware

Galaxy S2 I777 Rooting LogoSo, for all those who have updated their Samsung Galaxy S2 devices powered by the att networks can now root their phones which are on the latest version of Gingerbread 2.3.5 version. In the due course of this article we will check out on how you can easily root the phone. Please note that in the process of rooting the warranty will get void. Also, we have made sure that all the instructions are written properly and with utmost clarity without the use of jargons for simple understanding. Just in case if you are rooting your phone for the first time then you might just want to know on what are the advantages, disadvantages and also the procedure to un root the phone so that you can then claim back the warranty which you will lose once you root he phone. For your simplicity we have broken this article into two different pages, on this page we will see some basic instructions  about rooting and then in the next page we will check out the instructions to root the phone.

So, before we proceed to see on what exactly rooting means, you should ensure that your phone is on the Gingerbread 2.3.5 version of UCKJ1 and no on any of the version as this may or may not root the phone if you are on any other version of firmware. To know on what version of firmware you are currently on then you need to go to the path Settings > About Phone > Firmware Version where you will find the version of Android OS where it will show as shown in the below screenshot. Just in case, if there is any change then it’s not recommended to proceed to root the phone. You can update Samsung Galaxy S2 I777 by following the corresponding procedure. Please note that this procedure should be only applied to the phones which bear the model number as I777 and is not valid for Galaxy S2 GT I9100 or similar looking handsets.

What is Rooting?

Rooting is basically a procedure wherein the access to system files is established so that the third party apps or tricks can access or modify the system apps for better customization. Rooting also opens up a whole new functionality window wherein you can then apply custom ROMs as well as other applications which even allows you to over clock the phones.

Advantages of Rooting:

  • Allows you to Over clock the CPU Processor Speeds to almost additional 50%,
  • Allows you to install the custom ROM firmwares,
  • Allows to convert the laggy RFS File system with the speedy EXT4 file system,
  • Allows you to remove the system apps which comes pre loaded with the phone,
  • Allows you to make many more customizations with the help of ROM Manager etc.

Disadvantages of Rooting:

  • Rooting voids the warranty, though the warranty can be claimed as soon as the phone is updated with the factory or default firmware.
  • If procedure is not followed properly then you might brick the phone

Advisory: We should not be held responsible or liable in any manner if anything wrong happens with your device, though which is a very unlikely if you follow the instructions which are mentioned in the article. So, it’s very important to follow all the instructions carefully before you proceed to root the phone.

Please note that in this process you need to disable any Voodoo lag fixes if applied from the recovery mode or else it will brick your phone. The recovery mode can be entered by pressing  Volume Down Key + OK button, and holding both simultaneously press the Power Button. You need to get into the Advanced mode to disable any sorts of Lag fixes are there. You can also refer the video which is shown below to enter into the recovery mode.

Procedure to Root Samsung Galaxy S2 I777 at&t Phone:

  • First up you will have to download the Galaxy s2 i777 Rooting Zip file from here which contains rooting files like the kernel, Super one click root along with the Odin 1.82 version. Please note that as soon as you download this zip file you will have to extract the same and in the process of extraction it will prompt you for the password. Enter the password as “” without the inverted comas.

Extracted Files I777 Rooting

  • So, once you are done with the unzipping you will now need to power Off the device and then you need to enter into the download mode. The download mode can be entered by pressing Volume Down Key + OK button, and holding both simultaneously press the Power Button. You can also refer the below video with which you can easily enter into the download mode.

  • Now, open the Odin Flash tool in your computer and select the kernel which is named as “SGH-I777_ClockworkMod-Recovery_5.0.2.3” by clicking on the “PDA” tab and simply click on the “Start” tab to start the process of rooting and once the phone is rooted successfully you will then see that the phone is rebooted.

Odin for S2 I777

  • Please note that before you click on the “Start” tab you need to ensure that in Odin the ID : COM section is turned yellow which will mean that all the drivers have been successfully installed and you are ready to proceed with the rooting process. Ensure that in Odin you don’t select the Re Partition option and match all the settings as shown in the below screen capture.

Select PDA

  • Now, once the phone is re booted you will have to now proceed to enable the USB Debugging in the phone. The USB Debugging can be enabled from the path “Settings > Applications > Development > USB Debugging”.

USB Debugging

  • So, once you enable the USB Debugging Mode you will now need to connect your phone with the computer and then open the Super One Click Root executable file in your computer, click on the “Root”.


  • As soon as you click on the “Root” you will see that the phone will be rooted and then the phone will be rebooted again. The need to root the device second time with the help of the Super one click Root is that the at&t drivers can only be rooted with the help of the Super One click method and the normal android rooting is done by the above process of Odin.

So, in this way the phone has been rooted successfully. Do let us know just in case if you face any issues in the comments section below as we will try our level best to ensure that all the comments are replied at the earliest.



  1. Joev Renthlei

    June 6, 2012 at 4:33 pm

    super one click doesnt work on my computer….what do i do??

  2. Mr Salad Dressing

    January 18, 2012 at 10:28 pm

    My i777 has 2.3.6 with UCKK6. Does this method still work to root the setup I have?

  3. chuck G

    November 23, 2011 at 6:01 am

    Upgraded my firmware to gingerbread 2.3.5 and now my gallery doesn’t work. Don’t know how to fix it. Every time I try and open an image it freezes and force quits. Any suggestions?

    • NeaL Pradeep

      November 23, 2011 at 11:39 am

      you can try clearing the cache from the recovery mode!

  4. Mike P

    November 11, 2011 at 1:32 pm

    Is there a working version that doesn’t disable wifi yet?

  5. Troy Kelly

    October 26, 2011 at 2:08 pm

    All this does is wreck my phone.

    After flashing – the buttons stop working, no “menu”, “home” or “back” buttons after about one minute of the phone being booted.

    This “root” method seems invalid – and anybody using is it misguided to try. Wait for something from a trusted and reliable source.

  6. skeptics

    October 26, 2011 at 11:19 am

    Recovery Mode doesn’t work after SuperOneClick rooting.
    1. As others mentions, Wi-Fi doesn’t work.
    2. Also in the start menu, they said GT-1900 not i1777.

    I want to go back to factory setting, but in the Recovery menu, the menu list turn blue and if I punch the power button, just fedora with arrow show up and that’s it.

    I can’t go back to factory setting any more.

    Am I the only one this happen?

    • skeptics

      October 26, 2011 at 11:22 am

      I found that the OK button is not power button.
      Since this GT-I9100, and home button is the Okay key.
      But still, same issues.

      Any body out there to help me ?

      • NeaL Pradeep

        October 26, 2011 at 10:34 pm

        this firmware is applicable for the I777 Model and not for i9100

        • skeptics

          October 30, 2011 at 8:19 am

          Mine is i777 (AT&T Variant).
          After follow the procedure, Android recognize my phone as GT-I9100, not i777.

          That is my problem.

          • NeaL Pradeep

            October 30, 2011 at 11:38 pm

            what was your base firmware version earlier?

    • NeaL Pradeep

      October 29, 2011 at 6:16 pm

      yes its for I777 users only!

  7. Jason G

    October 23, 2011 at 2:27 am

    This was my first try at rooting the the SG2. I say that I took my time with it, but I got through it. I did run across a couple of sweat moments.
    First, I got my phone into download mode and launched Odin. The drivers needed weren’t installed. Therefore my Phone was stuck in download and Odin did not have the yellow box. My phone was unresponsive. Taking a huge breath , I unplugged the battery and reinserted it. The phone booted like normal. So my advice for any newbies is install KIES first and make sure it communicates with your phone before using Odin and getting into download mode.
    Second, Step #6 does freeze, i unplugged, like others have stated, replugged and it continued successfully.
    In closing, not having ads any more is wonderful, and thank you the the fine folks who provide this ability for us folks who couldn’t have done this on our own!

  8. Alex A

    October 22, 2011 at 12:23 am

    I tried rooting using the above procedure and now wifi doesn’t work. is there a fix?

  9. OlegK

    October 21, 2011 at 7:31 am

    I just followed a procedure and it worked but had to undo it since WiFi is not working 🙁
    If you already updated to 2.3.5 and want to get into download mode all you need to do is to hold both buttons volume up and volume down while connected to usb cable and then turn it on, while holding buttons, it will put phone into download mode.

    I also had a problem it got stuck on step #6, I just removed from usb and inserted it back and it simply continue from the point it froze.

    If not for WiFi not working I would be using this version.
    Anyhow, thanks to those provided rooting instructions.

  10. shah

    October 18, 2011 at 8:20 am

    plz help me….my phone have a problem.its seem appear a warning logo after i upgrade firmware KE18.
    will i upgrade KE18 with odin it said phone can`t get into download mode …….plz help me urgent

    • shah

      October 18, 2011 at 8:34 am

      how can i fix my phone problem its can`t get into download mode

    • NeaL Pradeep

      October 18, 2011 at 10:42 am

      we mentione dthat if you are unable to get into the download mode then dont apply this update!

  11. Tim

    October 16, 2011 at 6:23 pm

    The phone works fine for me on 2.3.5 not rooted, but it’s rooted that’s when the problems occur for me. I will stay at 2.3.5 unrooted and wait.

  12. Joe Craftsman

    October 16, 2011 at 11:01 am

    From the lack of information on rooting the AT&T Samsung Galaxy S ii …
    Android Version 2.3.4
    Model number: SAMSUNG-SGH-I777
    Kernel version:

    This release is fairly new and this is one of the only posts with the correct files to root this phone…

    Q: These are the correct files above for this phone?

    Q: Any Software updates through the AT&T server would require a re-rooting of the phone? Such as Android Version?



    • NeaL Pradeep

      October 16, 2011 at 12:31 pm

      yes you can root the phone!

      • percy

        October 17, 2011 at 12:19 am

        yes. firmware UCKH7 can be rooted. no issues that I had seen yet. thanks.

    • Jacob Smith

      October 18, 2011 at 2:49 am

      I just bought the Galaxy s2 yesterday and I’m fairly new to this whole concept of rooting. But I’ve been doing research and I can’t find anything on being able to root the version you listed above. I have the same exact specs:

      From the lack of information on rooting the AT&T Samsung Galaxy S ii …
      Android Version 2.3.4
      Model number: SAMSUNG-SGH-I777
      Kernel version:

      Can I use this guide to root my phone still? A helpful would response would be greatly appreciated! Thanks!

      • NeaL Pradeep

        October 18, 2011 at 10:48 am

        yes you can apply this rooting procedure!

  13. Tim

    October 16, 2011 at 7:01 am

    Also wifi turns of after it searches.

    • percy

      October 16, 2011 at 12:30 pm

      what i did is roll everything back to 2.3.4 UCKH7 firmware until there is a solid fix UCKJ1.

      • NeaL Pradeep

        October 16, 2011 at 12:33 pm

        we will try to come up with THE UCKH7

        • Percy

          October 29, 2011 at 4:52 am

          Thanks Neal.

      • Kevin

        November 1, 2011 at 12:34 am

        This might be stupid question but how do you roll back to 2.3.4 UCKH7 after installing 2.3.5? I cant find the firmware I need anywhere. Thanks.

        • NeaL Pradeep

          November 2, 2011 at 10:37 am

          yes kevin, by following the corresponding instructions you can go back to any update!

  14. Tim

    October 16, 2011 at 6:01 am

    Sorry step 6 of the Super One Click

  15. Tim

    October 16, 2011 at 6:00 am

    Hey I went through the process, two issues, on step 6 it freezes, i unplugged it, and it went to step 7 and and it was rooted properly. Then when i reset it, on the screen it states on the first screen its the I9100 and there is an exclamation mark on it also. Otherwise everything else is good for it.

    • Jon

      November 22, 2011 at 7:58 am

      That’s just a security thing by samsung to tell if the phone is rooted. If you unroot it, then this exclamation point and yellow triangle will be gone.

      • NeaL Pradeep

        November 22, 2011 at 9:27 am

        exclamation symbol means that its either in download or in recovery mode!

  16. percy

    October 16, 2011 at 5:21 am

    I had was able to install the rom. I ran Odin SuperOneClick, during Rooting, it stopped at Step #6, so i used S2 Root and was able to finish the rooting process. After reboot, the problem is the Wifi is disabled. you can manually turn it on, and after a few seconds of scanning, the wifi will turn off.
    is there a fix for this issues? the Rooting procedure #6 hung up and wifi is disabled?
    Thanks a lot.


    • Jinlin

      October 28, 2011 at 8:56 am

      I have the same problem!!!
      I try three times.
      I installed ROM(2.3.5) first, then I ran odin recovery The WIFI didn’t work.
      But I ran SuperOneClick and clicked “root” , it stopped at Step #6
      ROM 2.3.4 worked well.

      • NeaL Pradeep

        October 28, 2011 at 12:18 pm

        on which device are you applying this?

        • Kris

          November 2, 2011 at 3:39 am

          its i777 samsung galaxy s II from AT&T

          • NeaL Pradeep

            November 2, 2011 at 10:23 am

            yes kris, you can proceed with the update!

        • Kris

          November 2, 2011 at 3:41 am

          Actually hes right, after you root, it gets stuck at step 6, unplug your device then replug it back it, it will then allow you to finish rooting….lol difficult little bugger

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