Hard bricked i747, debrick.img not working

I hard bricked my SCH-i747 using UCUEMJB_to_UCUFNE4_Firmware_update.zip from http://forum.xda-developers.com/gala...pdate-t2808654. I know I was on the MJB radio firmware. I mistakenly assumed that when I updated the radio I also updated the bootloader. I found reference to I747UCDMG2 in a log file from two years ago when I rooted, so unfortunately, I think I was on an earlier bootloader version. I flashed the zip using TWRP and booted, but got "no SIM detected" so I attempted to reboot and now seem to be hard bricked. I tried debrick-SGH-I747U-CUEMJB3.zip from http://forum.xda-developers.com/show....php?t=2549068, and debrick.img from http://forum.xda-developers.com/show....php?t=2660566 several times each with no luck. I went out and bought a new 16GB Class 10 SD card and still had no luck with either image.

Any idea what (if anything) I can do to recover? I can connect to the phone in download mode using QPST, but I'm not seeing an obvious way to recover using that tool. I'm assuming I'll need to load firmware via JTAG. I found the pinout and have a J-Link JTAG (hoping that it will work for this...). I'm just not sure what to flash and where to get the firmware. Thanks for any help you guys can provide!