S4 won't root

A couple of things, first your card must be formatted to exFAT and not FAT32, if its a 64GB card you can format it to exFAT on the phone, if its 32GB or less you need to format it on your computer. Next try it again, I ran into that issue the first time and when I did it a second time, and rebooted SuperSU was there.
 

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