I need help with installing the Alliance ROM PLEASE. topic

Hi. I'll cut to the chase. I was an idiot and thought I could just flash the Alliance ROM from my SD card, but my phone is currently a factory restored 5.0. Not sure if it's still rooted because I factory reset it and wiped it's cache. I haven't tried booting it back up since I tried flashing the ROM. I went into recovery mode and tried installing the ROM, and it said something about a failed signature, which I'm guessing means I can't do it unless I'm on Alliance ROM's corresponding version, 4.4.2. So, what I'm wondering is, do I download a flashable modem, or do I download the tar? Or the flashable full stock tar? I'm looking at this link: http://forum.xda-developers.com/veri...odems-t2842069

It SOUNDS like I need to flash a full stock tar using Odin, is that correct? Once I do that, I would be on stock wiped 4.4.2, I assume. From there, could I flash the Alliance ROM and continue with the instructions? I feel like Beans was really vague with his instructions on installing ROMs, but whatever. Please help though, I'm kind of stuck in the middle of this with a softbricked phone.

Thank you so much in advance, I appreciate it.

~isra

EDIT: Also, I was on ROOTED 5.0 Lollipop just before this. I just got so sick of lollipop, I was ready for something different. So here we are. To confirm, my phone is the standard retail SM-G900VZW model.