Root I727UCMC1 AT&T Galaxy S2 Android 4.1.2 Jelly Bean Update using SuperSU

Here’s a working method to root AT&T’s Samsung galaxy S2 (SGH-I727) Skyrocket that has been upgraded to official Android 4.1.2 Jelly Bean build- I727UCMC1. To root your Galaxy S2, all you need is to install the latest SuperSU via TWRP recovery. This root method has been tested to work with the latest Jelly bean update. So, just follow the step by step guide below and get your device fully rooted.

androidayos jellybean cover

Disclaimer: Rooting voids the warranty of your device. Proceed at your own risk!

Download the following files
TWRP recovery: openrecovery-twrp-
SuperSU 1.2.5 SuperSU download

USB Driver – download
Odin3_v3.07 – download

Again, this rooting method only works with AT&T Samsung Galaxy S2 with running Android 4.1.2 JB build I727UCMC1, do not use it other Samsung galaxy S2 variants.

Step 1: Install the Galaxy S2 TWRP Recovery

  • Make sure the battery is fully charge
  • Run Odin downloader tool.
  • Reboot the phone into download mode – Turn it OFF. Then hold down both volume buttons and plug connect USB cable into your phone. (or hold volume down and power button). Press the volume up button when you see this menu.
  • Just be sure that Re-Partition is NOT checked. leave Auto reboot and F-Reset time checked by default.
  • Click the PDA button in Odin. Browse to the TWRP file “openrecovery-twrp-” you
  •  downloaded and select it.
  • Now hit Start button and Odin will flash the recovery.
  • Once Odin has finished flashing you will see a green PASS.


Step 2: Install SuperSU to Root your Galaxy S2

  • Copy the UPDATE-SuperSU-v1.25 in the root directory of your SDcard.
  • Reboot into recovery. Power off your phone. Hold both volume buttons and the power button at the same time. When the phone vibrates, let go of the power button but keep holding both volume buttons. In a few seconds you should be in the recovery menu.
  • Navigate to “Install Update from SD card”
  • Now look for the then install it.
  • Just follow the TWRP prompts.
  • Now your fully rooted.

How to unroot?

If you need to undo root, all you need is to Odin back to stock I747UCMC1 on your Galaxy S2 i727, grab it here and flash it through Odin same method in flashing the TWRP recovery above

This Samsung Galaxy S2 Skyrocket AT&T (SGH-I727) Android 4.1.2 Jelly Bean UCMC1 root method was originally posted by [forrest89sei] via XDA-developers original thread. Credits and thank’s goes to him and all the developers involved on this rooting method.

Does this root method perfectly works on your Samsung Galaxy S2 I727?  Tell us any issues you might encountered.

12 thoughts on “Root I727UCMC1 AT&T Galaxy S2 Android 4.1.2 Jelly Bean Update using SuperSU”

  1. Worked perfectly, thanks a bunch for these resources. I personally prefer ClockWorkModRecovery, which I installed by downloading ROM Manager from Google Play; but the method is the same.

    To Dominic Asta, I’m using my Skyrocket outside the country on MovieStar. There are several sites that instruct you on how to unlock the Skyrocket for use with any carrier (there’s a unique code to input for each phone), but you gotta get your credit card out. I rather doubt that AT&T is going to be very helpful, but maybe T-Mobile will be more cooperative. I had a local phone-geek-shop unlock it for use on ANY carrier, at a cost of a little under $20, but I’m not sure if such resources are available in the U.S. Check around for what works for you.

  2. I just got mi phone today and its already rooted, thanks to you, works great
    by tha way, Im from Mexico, hi to all

  3. This is not working for me. Odin will not even flash on my phone. I can’t get it to pass and I have checked everything several times. It just says All threads completed. (succeeded 0 failed 0). I am not sure what I am doing wrong.

    1. it looks like it is not flashing at all! You have a computer to device connection issue.

    1. No, So sorry to tell you that Odin will only run on Windows computers. There’s a Heimdall tool that works on MAC but I am not very familiar about it.

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