If you are trying to DOWNGRADE from OS 4.3 you will break your phone and possibly lose
warranty,because Samsung created a security system called KNOX.
This file here is only for android 4.2 ,flash at your own risk.
http://www.4shared.com/zip/O8jtIFV5/M919UVUAMDL_TMBAMDL_TMB_USA_T_.html?
Good luck!
