How To Update Samsung T999 Galaxy S3 Firmware Using Odin Flasher

Turn off your GS3 T999, Take its battery, SIM card, And MMC card out.
- Run Odin.exe
- By default the Auto Reboot and F.Reset Time are checked, So keep them checked.
- Open the extracted firmware folder and you will see one big file inside it:

For T999: T999UVDLJC_T999TMBDLJC_T999UVDLJC_HOME.tar.md5
For T999v: KIES_HOME_T999VVLDLL1_T999VYVLDLL1_CL616748_REV04_ user_low_ship.tar.md5

- The files we mentioned are only as example, You can use any version you want.
- Now click on PDA button at Odin's window and select the above firmware file.
- Put the battery into your phone, But do not turn it on.
- To put your GS3 T999 into download mode follow these steps:

Press and Hold Volume Down key, Then press Power key until you get the warning message on your phone's screen.
- Release both keys and press Volume Up key to be in Download Mod

Firmware t999:::
T999UVDLJA / TMBDLJA USA T-Mobile

Firmware t999v:::
- T999VVLDLL1 / YVLDLL1 GLW Canada Wind Mobile 
- T999VVLDLL1 / YVLDLL1 MCT Canada Mobilicity
- T999VVLDLL1 / YVLDLL1 VTR Canada Videotron