Bricked my phone!!!!

Hello world!

I am in need of help. I own a Galaxy S4 and I wanted to root it. I downloaded a root app I have used before on my tablet, but it did not have a root for my device. It triggered knox and labeled my android as custom. I rebooted the phone, and it got stuck on the Verizon logo. I deleted all loggs cache, EVERYTHING I COULD, and it still read custom. I stupidly deleted the OS too...
SAMSUNG activation lock is on still too. USB debugging is off so I cannot connect to my PC, and the...

Bricked my phone!!!!

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