Install stock firmware on my Galaxy S5 SM-900T I would like the correct info on how  to install stock firmware on my Galaxy S5 SM900T.  And what do I need to know about my phone before I do it. Like all the correct numbers so I do this correctly.
Thanks 
KPH
Official website for downloading firmware here.

For method of flashing, precautions and other requirements follow this thread


  1) extract/unzip firmware file (should show as .tar)
  
  2) download odin v3.09 or newer and extract
  
  3) open odin
  
  4) Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
  
  5) Connect phone and wait until you get a blue sign in Odin
  
  6) Add the firmware file to AP / PDA
  
  7) Make sure re-partition is NOT ticked and keep odin default settings
  
  8) Click the start button, sit back and wait few minutes