For those of you having problems with the latest UVUAMDL firmware, this is because T-Mobile has added a SetUID restriction on the kernel. This can easily be solved by flashing a stock kernel with the restriction removed.
MAKE SURE YOU ARE ON UVUAMDL build OTHERWISE THIS KERNEL WILL BREAK THINGS IN YOUR PHONE!
Then follow the rest of the steps to install CWM SuperSU zip file in recovery.
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You will need a rooted Galaxy S4 to install all ROM/kernels.
NOTE: THE AUTHOR OF THIS SITE IS NOT RESPONSIBLE IF YOU MESS UP YOUR PHONE, PLEASE READ INSTRUCTIONS TWICE BEFORE TRYING IF THIS IS YOUR FIRST TIME TO ROOTING AND CUSTOM ROMS!
First time to rooting and custom ROMs?
Please see our Galaxy S4 Root FAQ FIRST!!!