What's odd is this device is most assuredly an i747, yet on the phone's screen in Download Mode the Device Name field shows T999 for some reason. Might that have something to do with this failure to flash?
I was able to successfully flash a file earlier that rooted the device, successfully from the looks of it. SuperSU seems to be working fine.
Any ideas on how I can get this flashed so I can unlock the phone for use on Smart Talk?
Edit: After doing a factory reset from recovery I now get this from Odin:
<ID:0/004> Odin v.3 engine (ID:4)..
<ID:0/004> File analysis..
<ID:0/004> Get PIT for mapping..
<ID:0/004> Firmware update start..
<ID:0/004> NAND Write Start!!
<ID:0/004> FAIL! (Auth)
<OSM> All threads completed. (succeed 0 / failed 1)