I think I flashed the wrong thing I keep getting security notifications plz help

My camera won't work either any help would be much appreciated I tried to root b4 looking too much into this nightmare of a phone I'm also running t-mobile on unlocked GSM for at&t big mistake I know.
Difficulty adding screenshot sry noob.
V. 5.0
Bb version SMG900AUCU4C0I5
Kernel 3.4.0-5869384
dpi@SWHD 4323#1

Build# LRX21T.G900AUCU4BOF3

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