[Q] 4.3 MJ6 brick problem. topic

Okay so here is my problem:

-Bought AT&T phone off ebay Hong Kong. Using phone in Australia.
-SGH-I337
-4.3 MJ6
-Rooted it.
-Installed Safestrap.
-Backed up with Safestrap.
-Flashed GOLDENEYE v49.1
-*BRICKED*
-Safestrap recovery is GONE
-Stock recovery and download modes BOTH still work. When booted, the phone gets stuck on the Samsung logo/pulsating blue LED.

I've spent around 5 hours reading everything I can, but can't seem to find much regarding 4.3 MJ6.

Do I need to flash a 100% stock 4.3 MJ6 ROM to get up and running again? Does anybody know where I can find that ROM?

I've been using custom ROMs on HTCs for a couple of years, this is my first Samsung.

Thanks in advance.