This is what I'm about to use. It installs all pieces of the LJ7 firmware including recovery and radio. There's a root zip you can flash afterward to keep SU access. After that, I will setup SuperSu Pro to survive OTA updates and then run the MA6 OTA through the stock recovery. If you don't have SuperSu Pro or VooDoo OTA, you can always flash TWRP through Odin, and then flash your root zip, boot and then make your backup of the stock ROM.