[Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot] DAB_MTM_212:
HELP!!! Failed TWRP flash attempts, impassable FRP lock, screen went black!!!

Ok, i'm in severe need of assistance, basically it all started when i attempted to flash the TWRP 3.1.1 tar.img file using the "Official TWRP App" in an attempt to get Viper4Android FX to work on my L720T because i hate the stock EQ and it interferes with third party EQs, I already had full root access through Kingo Root but saw several posts saying that custom recovery was just wonderful and such a no brainer but mainly I could get V4A working correctly plus MAYBE i could try a custom ROM, well, I attempted TWRP recovery the first time and was faced with the "Reactivation Lock: On" issue so i broke out Odin3 and flashed the stock 5.0.1 firmware, unlocked the phone, went into settings and tried to disable the reactivation lock but it wouldnt disable, it would ask for my password but stay enabled, i followed a "working" tutorial where you delete your linked Samsung Account, deactivate the lock and create a new Samsung account but i can't add my new account, when i go to ANY Samsung app to link my new account i tap the sign in tab and it's completely unresponsive, the box shows animation from being selected but it denies any action, activation lock still won't disable BTW so i get the bright idea to do a factory reset to clear out my account issues, when i tried to reset through settings i was told that my Samsung account (deleted) was still linked and when i click the "erase everything" button the phone would boot me back to the Backup/Reset menu no doubt due to a funky response from the non-existent Samsung account, of course i boot into recovery and reset it that way, phone boots up and i'm told i need to enter the previous Samsung account info to gain access due to an abnormal factory data rest, by then i knew i was screwed, i attempt it anyways and sure enough it presents "Processing Error". Long story short from here on i used SideSync to get past the FRP long enough to add my new Samsung info and all available sign in links are still useless, the reactivation lock "appeared" to be OFF because it was no longer marked green. So, i did a "Normal" reset through settings like it said online to tell the device hey its okay you aren't stolen, my phone reboots, i'm STILL locked out by Samsung, I attempted TWRP once more for absolutely no good reason, of course it failed only this time it was stuck in Odin mode, I flashed stock firmware once again using Odin, phone boots up, my whole screen is solid black aside from the notification bar displaying battery, wifi, etc. The power menu also works. I figured before i render my phone a paper weight (if i haven't already) i'd come here in search of much needed ridicule for my increased failures of modding and hoping to get the great knowledge that all of you real modders out there, experienced with samsung and its ignorant anti-mod/security oriented measures, have tackled in the past. My device is the Sprint Galaxy S4 (SPH-L720T) running 5.0.1 firmware, as it sits right now its currently displaying ONLY the notification bar, stuck on the now invisible reactivation lock screen requesting an account that no longer exists, so please, ANYBODY that can help me in any way with this phone I will highly appreciate it, this is my only phone right now and i just want it back to its annoying SoundAlive focused self, sorry for the long post but i wanted to give all the details of my epic failures, thank you in advance!

---------- Post added at 01:52 PM ---------- Previous post was at 01:31 PM ----------

SLIGHT EDIT: i wiped cache in recovery, performed factory reset, and the black screen is gone, still FRP locked, keeps displaying network connectivity errors mainly related to dat, slightly irritating WiFi :can't connect to the internet" issue but i can get past that part easily, thanks again.