Uninstall latest update 5.1.1 for Galaxy S5?

Holy crap...just received 5.1.1 update yesterday, and it has completely screwed up my phone. (Galaxy S5 SM-900T)..constant lagging and memory issues, it's struggling to run multiple apps at once, and has completely crashed 4 times since yesterday. In addition, the battery seem to be working overtime, and is becoming extremely hot. Does anyone know if there's a way to uninstall this latest update??

Samsung Galaxy S5, SM-900T (TMobile)
Kernel version 3.4.0-5117004
Baseband version G900TUVU1FOF6

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