[HELP] Bricked phone, now Odin and Kies rejecting firmware reset

[Big Macintosh]

Last night I bricked my phone, trying to flash the stock modem (NAE) on mobile Odin. As of right now, it does not boot, simply being stuck at the SAMSUNG GALAXY S4 screen. It will not boot into recovery, instead rebooting to the same screen once more. Kies will not see the connection, and I have reinstalled it, the drivers, etc.

Odin does the same thing, but sees the connection. All I get is this after trying to flash the firmware (both with Auto Reboot and F. Reset Time on and off)

<ID:0/003> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> L720VPUFNAE_L720SPTFNAE_L720VPUFNAE_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/003> Odin v.3 engine (ID:3)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Get PIT for mapping..
<ID:0/003> Firmware update start..
<ID:0/003> aboot.mbn
<ID:0/003> NAND Write Start!!
<ID:0/003> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)
<ID:0/003> Removed!!

And the firmware that I am using is the "L720VPUFNAE_L720SPTFNAE_L720VPUFNAE_HOME.tar.md5." I don't know what to do, and I was thinking that someone could help me here.