Default Soft-Bricked SPH-L720

I was running CyanFox this weekend, and decided I wanted a newer rom. I installed a stock mk2 rooted rom, and it was encrypted. A forum post suggested that I wipe the device, so from my recovery I formatted the internal drive. I then loaded Odin, loaded a stock mk2 rom, and flashed it. The device started up, but only goes to a black screen. When I try to root it through Odin, it won't root.

Now whenever I flash a firmware through Odin, it fails. What's going on with my device? Is there anyway to save it?

When I turn it on now, or boot to recovery, it tells me a firmware upgrade encountered an issue. Please select recovery mode in Kies & try again.
Rooted AT&T (Straight-talk) Note 3 JB
I don't always buy android devices, but when I do, they get rooted