Need assistance - SM-G900A stuck at Samsung logo after stock rom flash

Hey all,

Looking for some assistance here. I apologize in advance for not having specifics on everything, but it's been a couple years since I've needed to do anything with this phone (SM-G900A). I picked it up used a couple years ago and shortly after, I did a NOX unlock and rooted the phone for two reasons - using Titanium Backup and to unlock the WiFi hot spot. I recently noticed that something had happened and my root access wasn't working correctly- guessing from one of the OTA updates that was attempting to occur on my phone. I say attempt, because I don't believe they ever successfully installed since they always seemed to error out. I'm currently on StraightTalk, not an AT&T customer. Something weird was up with it though, because I could never uninstall the Xposed Framework or app, yet Pokémon Go was recognizing it was rooted and blocking my access.

Fast forward to last night- I did my research, found a couple different tutorials that included the correct ROMs and applied one - G900AUCU1ANCE_G900AATT1ANCE_ATT.zip. After application, the phone will not boot and freezes halfway through the swirls around the Samsung logo, then goes blank. The blue notification light also stays lit on the phone.

Thinking it was most likely bootloader related, I found another ROM that included separate AP, BL, CSC files. I attempted to flash the bootloader again and got an error- unfortunately, I can't remember what it was and I can't find it in my google search log. I remember researching that as well last night and the videos I found mentioned it was related to a locked bootloader.

At any rate, it seems like my boot loader somehow got corrupted, but I was hoping some of you experts out there could provide some answers. At this point my phone is dead, so I'm hoping I can get it restored very soon.

Thanks in advance guys!

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