I need help repairing my phone.

Hello guys, this is my first post on a forum EVER, so here it goes..... The other day i decided to try and root my Galaxy Note 4 using KingRoot. it got to 53% done and my phone tried to reboot i believe. When it came back on it showed the loading/boot screen thing but in addition it displayed a picture of an unlocked padlock. i thought the rooting had worked but i was wrong. at the top left hand corner it said something along the lines of "Kernel seandroid enforcing" in red letters then displayed a message saying i had to take it to the nearest AT&T store, i guess to fix it. so i read a bunch of stuff online about it and nothing helped. I think my phone is soft bricked. here's a list of what it can do: it can boot into recovery, and it can boot into download mode, and it can display the message saying it needs to go to the nearest AT&T store. So the next thing i did was download what i thought was the stock ROM and tried to flash it in the stock recovery but it said the foot loader failed and the signature verification failed and it did nothing to fix my problem. Everything i have read requires using Odin and using custom recoveries. I do have the latest version of Odin installed but even after i installed the latest USB drivers for my phone, for the life of me, i can not get my laptop or Odin to detect my device. So i have no way to install a custom recovery to my phone that i know of, thus, no way to install a custom ROM, and i can not find a stock ROM or firmware for my phone. Like i mentioned before, i thought i had the stock ROM and could just flash it, but when i did it failed the signature verification. After reading so much i am completely lost and need A LOT of help. And by the way, i dont care if i lose my data and what not, because all i really have of value on my phone is music and its all on my laptop anyways. So any solutions that you guys come up with, don't worry about data loss.