[Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot] SuperG03:
So now I would like to reply as to try and help anyone else that might have had something similar to this happen to their phone. I DID FIX my phone but using a CRAZY method that I have no good idea of why it worked. So here goes...

LONG VERSION (Short Version below for those that don't want to read about all my trials and efforts):

So as I mentioned I was on MK2 before the problem started. I tried to ODIN the MK2 Stock ROM I downloaded here but it failed. So then I decided ok maybe the issue was the older ROM, so I downloaded the NAE Stock ROM and tried to ODIN that. Again, failed. Now both of these 2 tries got far into the process before they failed. So again, through reading various posts here and on other forums it was suggested to try with other version of ODIN (I had been trying 3.07). I then tried the MK2 ROM again but with ODIN 3.09 but it failed almost immediately. That is when I noticed the lines "SW Rev Check Fail Fused 5 Binary X" every time it tried and failed. My guess is that this has something to do with the whole not being able to downgrade ROMs at any point and since I had almost completed the NAE stock ROM ODIN flash, it was stuck only with the option for NAE. So then onto trying NAE with ODIN 3.09. Once again, got most of the way done but failed toward the end of the system.img.ext4 part. I kept noticing that on the screen, almost as soon as I started the ODIN process it would output a line saying Start [220, 1440] and then soon after a line saying BAR [224, 1440]. Now I still have no idea what any of that means, but it was always failing, mostly toward the end of the flash. I then tried other ODIN versions including 1.85. All with the same results. I was at a loss. At that point I got desperate and decided I wasn't even going to try and save my DATA and thought maybe the partitions got corrupted so I found the NAE PIT file from these forums and attempted to ODIN both the PIT and the PDA with re-partition option. Once again, all attempts with all ODIN versions failed, with the same START and BAR messages showing up. I then broke down and decided to post here for help. I kept reading but everyone kept just saying in other threads about maybe KIES interfering if it was active in anyway, etc. so I check my processes and there were no KIES ones running. At that moment something occurred to me about another process by which to flash that I remember from my Galaxy S2 days. That was Heimdall. So, I decided to go on a mission to learn how to use Heimdall myself without a ready package. I finally learned how and decided to try it. I had to extract out all the .bin and .ext4, etc files out of the NAE tar and load them up manually. I started to flash and it looked to be working but then alas, it failed similarly to how ODIN did. I was at my wits end by this point. However, something occurred to me when I realized that the .tar had all these independent files in it that ODIN just tried to do all together. So here is what I did that finally WORKED. I used ODIN 3.09 with the NAE PIT file and the NAE ROM PDA file. I checked only Re-Partition and unchecked all others. I then watched exactly what ODINs log said was being flashed to the phone and what failed. I kept re-flashing until I got passed the system.img.ext4 file and the it failed on one of the others. I made note at which files out of the 13 that came from the .tar file were sent by ODIN successfully before it failed. I then closed ODIN and restarted phone in download mode and went to Heimdall. I used Heimdall to manually select only the remaining files left of the 13 that DID not go through successfully. I then flashed those I think 3 or 4 files and it said it was successful. I then rebooted my phone and to my SHOCK the phone booted up successfully and went into the OS as if it was factory wiped and ready for first time use. I was a bit bummed about having to redo all my settings, etc again and losing my old Text Messages, etc, but was so happy to have my phone back up and running. Thanks for reading this whole thing (I know it was quite long) and I hope it helps someone else out of a similar jam.

SHORT VERSION:

GET NAE Stock ROM

GET NAE PIT File

GET ODIN 3.09

GET Heimdall

YOU WILL LOSE YOUR DATA

Step 1) Use ODIN 3.09 (Run as Admin) and load up PIT file and PDA. Uncheck everything but RE-Partition

Step 2) (Hard Part) Keep flashing over and over again until you get at least the system.img.ext4 part to go through before ODIN says FAIL (It should fail on another file, like hidden.img.ext4 or NON-HLOS.bin

Step 3) Scroll through the ODIN log on the left and note every file that was successful. Basically any files it says was successful until the last one that it stops at and says FAIL

Step 4) You will need to extract out the contents of the NAE Stock ROM tar file to another directory

Step 5) Use Heimdall frontend (Run as Admin) and use the flash tab

Step 6) Load the PIT file into Heimdall as that is required for anything. But DO NOT use RE-Partition option

Step 7) Click Add and select each of the remaining files with their appropriate Partition Name and browse for those files from the ones you extracted from the tar. There are 13 files total from the tar file. Just load up (Add) starting with the file that failed in ODIN and then load up whichever ones that did not show up on the ODIN log at all. Click Start and cross your fingers

Step 8) If all went well, the phone should reboot and be up and running. If not you might have to start at Step 1 and try again

Step 9) Jump For Joy that your phone is Alive and working again!!! :)

Once again, I wanted to share my experience with everyone in hopes that it will help someone else out. I have no idea why I had to go to such great lengths of combining 2 versions of FLASHING and doing it piece by piece, but that is for greater minds then me to either know or figure out. I'm just happy my phone is working again! Good luck to anyone else having a similar issue.

SuperG03