[Samsung Galaxy S7 Edge Questions and Answers] Uyx:
Now I've searched just about all of Google on this, but I haven't been able to find a solution yet. Everyone here seems to know the most about this kind of stuff so I figured I'd make an account and explain my situation.

Backstory / How it happened

So, earlier today I figured I'd root my AT&T S7 Edge, I used a tutorial from Max Lee (I can't post links yet but if you need to find it I'm sure you can Google it) to get the job done, and after a while I managed to get the thing rooted. I knew absolutely nothing about what the hell flashing, roms, bricked phones, bootloops etc. were and now I only know a bit about them. So the phone was rooted just fine, I had SuperSU running, and a few other root apps, but then I figured I'd install xposed installer. So I went ahead and downloaded the wrong version (whoops) and it installed its framework and then said it needed to reboot my phone, low and behold we have a bootloop. It stays at the AT&T logo indefinitely if I'd let it. I'll happily admit to that being completely my mistake, I read the warning that it may cause a bootloop but I went ahead and installed it anyway thinking I could fix it if it happened. (This thread is my walk of shame I suppose)

Solutions I've tried

Now that the background has been explained, I'll go through the list of solutions I've tried, mind you I'm no expert at any of this so some of the info I give may seem redundant or nonsensical.

- Rebooting into recovery and clearing cache and factory resetting in every order you can imagine

* Only interesting thing I could find is that it still says custom on both the download mode (the one where you press vol down, power, and home) and when you reboot the phone and it goes through the initial animation, it shows custom with a little settings-looking icon just before it goes through the AT&T animation and takes a **** on my self esteem.

- Waiting ~1 hour for the AT&T logo to change to something other than an AT&T logo (I was desperate)

* Yeah nothing came out of that one...

- Flashing every stock firmware I could find on the internet, with every version of Odin I could find.

* Kept getting the same error, "FAIL! (Auth)". I looked it up and all I found was old threads from 2013 on the Galaxy S4, with some now-irrelevant information, I couldn't seem to get it to work, but I'm positive that's what I need to do unless you guys know another solution. Here's the full log:

<ID:0/005> Added!!
<ID:0/005> Odin engine v(ID:3.1203)..
<ID:0/005> File analysis..
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Set PIT file..
<ID:0/005> DO NOT TURN OFF TARGET!!
<ID:0/005> Get PIT for mapping..
<ID:0/005> Firmware update start..
<ID:0/005> SingleDownload.
<ID:0/005> emmc_appsboot.mbn
<ID:0/005> lksecapp.mbn
<ID:0/005> FAIL! (Auth)
<ID:0/005>
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

Don't know what I did but after that at the download screen it says at the top left "SW REV CHECK FAIL : [aboot]Fused 4 > Binary 2

Sorry for the wall of text, I tried to format it as nicely as possible to make it somewhat readable. If anyone needs more info let me know.