For those who’d been looking for the root method that works on T-Mobile Galaxy S3 (SGH-T999L), the LTE-enabled version and currently running on the 4.3 update T999L UVUBMK4, here’s your root. This root method is called “root66″ and this is the first root build or created for Galaxy S3 SGH-T999L,  which developed by [mrRobinson(Highly recognized developer from XDA-Developers).  As I said, first time around for Galaxy S3 LTE T999L version for this was already been used and a tested root method for the other TMO Galaxy S3 (T999) even before 4.1.1 and 4.1.2 updates.  But this build is only intended for the 4.3 update UVUBMK4.  This rooting method is technically the best rooting technique we have been used long-time before 4.1.2 for it did not and or will not compromised the phone’s warranty bit or the binary counter.

When the 4.3 update came around, this caused chaos to all advanced users who’d been aware of the new KNOX implemented on 4.3 bootloader. This KNOX matters to most people for there is a new Warranty Bit in the 4.3 bootloader that once tripped, it cannot be reset. The ‘root66 T999L UVUBMK4 ’ is a complete stock firmware only added with root and the KNOX is also removed, so there is no worry to tripped that ‘Warranty bit counter’ anymore.

root t999Luvubmk4 Tmobile Galaxy s3

For those who did not even heard and tried this root method, you may have to read the whole thread from XDA-Developers which can be found at the source link below. Those who already used it before and are willing to give a  try right now just follow our simple guide below.

The ‘root66′ rooting method  used the pure stock T999LUVUBMK4  firmware, but the techniques use here was by simply  injecting the root image unto the official firmware, and once the firmware installed – this will automatically adds root permission to the device. This root is so simple but yet so effective and safe, and this can be done easily in a single installation.

In addition, if you use this root method on your T-MO Galaxy S3, you do not need to worry about receiving future OTA updates again. Some owners who used to gain root with other rooting method without their knowledge, freaked-out when their device failed to accept OTA updates. This rooting process will not block your device and can accept any OTA updates again. But don’t mark my words into it, just try it on your own!

Disclaimer: Use of this root method is solely at your own risk! Rooting voids the warranty of your device.  Please proceed with precautions.

How to Flash the Root66_T999LUVUBMK4

Odin flasher – Odin3_v3.07
USB Driver –  Samsung Android USB Driver
Download and Extract the stock_root66.tar from the .7z file from the link below
T-Mobile LTE Image
December 2013 – 4.3 JellyBean
Note: This is based off of the stock image TMO T999LUVUBMK4
Download – root66_TMO-L_T999LUVUBMK4.7z direct from [MrRobinson] XDA-Original thread: http://forum.xda-developers.com/showthread.php?t=1771687

  • Back up all important files stored from your device, such as contacts,SMS, emails, photos, videos etc.
    This process will not delete your files, but just in-case if you aren’t much familiar about the procedures and  something might went wrong that force you to do a full factory reset, your files were in safe place.
  • Make sure to fully recharge your battery
  • Use PC with Windows OS (Odin will not work on Mac and Linux OSX, sorry guys)
  • Use the original supplied USB cable for your Galaxy S3

1. Run Odin on your PC desktop
2. Boot the Galaxy S3 into download mode screen for Odin.
Turn it off, once completely shut down  hold down the ‘HOME’ + ‘VOLUME DOWN’ buttons and press the ‘POWER’ button for about 2 seconds until a WARNING! Screen appears. Press the ‘VOLUME UP’ button to continue or enter Download Mode.


3. Connect the phone to PC via USB. Then make sure you can see as phone “Added” in Odin log box or highlight the COM:ID once the device is detected,
4. In Odin window, DO Not tick ‘RE-Partition’  only Tick ‘Auto Reboot’ and ‘F. Reset Time’ and nothing else.
5. Now load the root system image root66_TMO-L_T999UVUBMK4.tar.md5  on the PDA button.

6. Click on “Start” to flash the stock ROM with root system image.
7. Wait until the flashing finishes and the phone completely reboots.

Optional: In-case you just stuck on welcome screen logo, you may simply fix it by performing factory data reset. Just turn it off then press ‘HOME’ + ‘VOLUME Up’ buttons and press the ‘POWER’ button. Then select Wipe Data/Factory reset then finally “Reboot”.

How to Unroot?

If you wish to unroot or return back your Galaxy S3 T999L to factory stock, you can do it anytime you want. All you need is grab the original 4.3 T999L UVUBMK4 stock firmware (SGH-T999L stock firmware) onto your device. The installation method is the same using the Odin flashing instructions above.

Have anything to say? Do this root method perfectly worked out for you or not? Let everyone hear your comments about this root method.

Share →

10 Responses to Root TMO Galaxy S3 T999L UVUBMK4 4.3 Update, KNOX Free and No Warranty Flag Tripping

  1. Mr Lock says:

    This method worked for me on my t-mobile galaxy s3 LTE. Successfully rooted and haven’t seen KNOX anywhere.

  2. Mr Lock says:

    In download mode, my warranty flag was changed to 0x1 though. This possibly because I had tried a different method before flashing this? Regardless, it hasn’t affected my life in any adverse ways yet.

  3. ashley says:

    There is NO LINK for the stock_root66.tar

  4. Brian says:

    The file says its corrput everytime i try to extract files. Please fix this

  5. Pamma says:

    Any way to go back to 4.1.2 after being on root66_TMO-L_T999UVUBMK4.tar.md5 ?

  6. NoobBot says:

    Where can i find the Odin program?

  7. DraksFangs says:

    Tried it and loved it, fast and easy. This is only my 4th phone/adventure into rooting so I am still a noob. Now I need to get Wi-Fi tethering. I keep finding one page tells you to “do it this way” then another page saying “don’t do it that way try this way” I just need to find a way that works.
    I have a T-Mobile rooted (thanks to you guys and this page) Knox free, but no bootloader, and no Wi-Fi tethering. Any help getting the Wi-Fi to work would be greatly appreciated. We have the T-Mobile unlimited data but can’t use it with laptop or tablets, and sadly where we are that’s the only way. No DSL, cable, fiber optics, don’t make me go to dailup, please God don’t make me use dial up…….. KKHHHHAAAAAAAAANNNNNN!!!!! ( sorry that’s the sound of despair with a star trek twist)

  8. Les says:

    Will this root method work on the T Mobile SGH t999 L with ROM version t999l UVUBNF4 ?

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>