There is no full tar file for NAF and probably won't be for several weeks. You NEVER flash older tars with the S4 anymore. Once Samsung implemented the full knox bootloader it prevents you from going backwards. Your best bet if you want your phone to work is to take it to Sprint and tell them the update to Kit Kat failed and they should be able to flash your phone back to NAF, or they will replace it.
I see you were involved in that thread I linked him. That update zip would not help him since the phone is bricked right? I've never gone that route myself so that's why I'm asking. That'd be my take on it right now, I seem to have over looked that when I linked him that.
Also there was a thread on here for the regular l720 that included a couple files and the use of Odin to get people unbricked and then I think able to use an update zip. Have you seen that? Just throwing that out there that's all. That method is a tad more involved but did work for a few people to unbrick their NAE S4's after they tried downgrading to mk2.
Now since that method wasn't for the tri band s4, I think finding the needed files may be hard. Again I'm just tossing this out there to get your feedback.
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