Default SAFESTRAP gets stuck at "updating partition details"

Been trying to figure out what so many have seemed to figure out, but what seems to be a major PITA, and that is flashing a rom onto a AT&T S4. Srsly. Wth. Hard bricked this thing once trying to do it. I'm already gun shy. But determined. But yet not skilled or trained.

It's rooted, not encrypted, SS installed, se Linux mode changer to get SS to work ("safestrap stopped working then a screen with a sad android, recovery or reboot, I think, then boots normal).

But then it stops at:
Finishing running boot script.
Updating partition details


Nc1 build.
was following this tutorial. http://galaxys4root.com/galaxy-s4-ro...are-safestrap/