This is the first official update for T-Mobile Samsung Galaxy S3 to upgrade to Android 4.1.2. If you haven't yet updated your Galaxy S3 T999, now is the right time to do so! Follow this guide with detailed instructions to upgrade to the latest Android 4.1.2 Jelly Bean UVDMD5 official firmware.

Firmware details:

PDA:T999UVDMD5

CSC: T999TMBDMD5

Version: 4.1.2

Note:this tutorial is only for Samsung Galaxy S3 model number T999.Please do not try it on other models.

Prerequisites before you update Galaxy S3 T999 to Android 4.1.2 UVDMD5 Jelly Bean officialfirmware:

Back up all your important data before starting the installation process.Enable the USB debugging in your Samsung Galaxy S3.Make sure you have USB drivers for Samsung Galaxy S3 on your computer.Ensure to charge up your SGS3 T999 to at least 70%.

How toupdateGalaxy S3 T999 to Android 4.1.2 UVDMD5 Jelly Bean official firmware update:

Required files: downloadAndroid 4.1.2 UVDMD5official update for Galaxy S3 to your computer and extract thezip file. Also download theODIN v3.07through which we will be updating the smartphone.

Switch your Galaxy S3 off and enter in theDownloadMode: press and hold theVolume DownandHomebuttons simultaneously and then press thePowerbutton till you see the Android bot. Press thePowerkeyagain to confirm.Now openODINexeon your computer with admin rights and connectyour phone to the computer while in the DownloadMode. When S3 T999 is successfully connected, theID:COMboxes will turn yellow.Now select the files to flash on the SGS3, downloaded earlier.1.click onPDAand select file withCODEin its name -required2.next click onPhoneand select file withMODEMin its name -ignore if there is no such file.3.now click onCSCto select the file withCSCin its name-optional.4.and finally click onPITand select.pitfile-ignore if there is no such file.After selecting these files above, inODIN check theAuto RebootandF. Reset Timeoptions. Also check the Re-Partitionoption, only IF you selected a.pitfile in the above step.Once done with files and checkboxes, hit theStartbutton inODIN. Installation process will take a few minutes to complete so please be patient.When the installation is done successfully, your Galaxy S3 will restart automatically.When you see the home screen, you can disconnect yourphone from the computer.

Your T-Mobile Samsung Galaxy S3 T999has now been updated to the official Android 4.1.2 build UVDMD5. To verify, go toSettings>About phone.