I have soft bricked my AT&T HTC M8, what can I do to revert back to stock?

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Hello!

So I recently replaced my stolen AT&T HTC M8 with an a refurbished one and decided to root it for my first time. Unfortunately, I fell into the common mistake of using the outdated Hasoon2000 All-in-one toolkit. I'm not well-knowledged in phones, but I definitely want to learn (which is why I am here). I know I should've been more cautious and prepared prior, but all I can do is learn and move forward now. I've spent a few hours researching and trying to understand the process, but there is a lot of technical aspects that I haven't grasped yet. Well, here is my situation:

My phone is currently soft bricked and I am unable to access my phone's UI when I boot it. After the HTC One logo, the phone will be black and consistently bring up, "unfortunately AT&T ready2go has stopped". It will also say that the UI has stopped and I have no choice but to turn off my phone. Prior to this, I had an issue with Superuser where there was no binary so I tried to re-install it thinking that would do something; I then performed a factory reset (thinking it would somehow fix it). I realized after this that TWRP and SU were both out of date and now I'm here not sure what to do. I would like to be able to flash the RUU to revert back to stock and go through the rooting process manually but I haven't had much luck with the .exe file so far; do I need to have S-OFF and/or relock my bootloader? If so, how do I do that? I'm still learning, and it's a lot to pick up, so bear with me please as I try to piece together everything. I've been searching through the forums, but it hasn't really helped me too much.

Here is what my Hboot says:
*** Software Status: Modified ***
M8_UL_CA PVT SSHIP S-ON
HBOOT-3.19.0.0000
RADIO-4.0.U605611@50319A
OpenDSP-v47.2.2-00564-M8974_F0.1024
OS-
eMMC-boot 2048MB
AUG 4 2015, 23:21:05.0

Getvar All (not exactly sure what this is, but I saw other help posts listing it and figured it's useful)
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 4.0.U605611@50319A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: xxxxxxxxxxxx
(bootloader) imei: xxxxxxxxxxxxxxx
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 7f8e91a3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

If anyone could give me some guidance/clarity then I would truly appreciate it! Thank you!
 

Golfdriver97

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Dec 4, 2012
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Welcome to the forums. You should be able to RUU back to stock with a Windows machine. You can download the file from HTCs site, and then use Windows to open the program that comes with the ROM file.
 
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