Stuck on Samsung Logo, No Recovery, No charge..(SM-G955U)

( THIS IS ORIGINALLY FROM AN EMAIL TOWARDS DR.FONE REPAIR TECHS, ECT... DIDN'T WANT TO HAVE TO RETYPE EVERYTHING AGAIN)

I have a Galaxy S8+ (SM-G955U). I rooted it but forgot to install Twrp with it.
After a few days it was working just fine, then suddenly after I let it die out of charge, it did not turn on. First, the Issue was loading into Download mode (still happening), it loads but the screen is black. I use Odin so it tells me when the Pc recognize it, and it does. I tried flashing stock ROM with Odin but it stays on setup and if not it stays on Initializing forever, now the problem is a bit easier to solve because it just stays stuck on the Samsung Logo. This is why I purchased your product.
I searched and searched for fixes but your Product is the only thing that seems the best way to approach this problem.
The days after I can only boot to Download Mode nothing else. Not even Recovery Mode.
When I plug in the phone to Pc to fix it, it doesn't work.
The firmware loads and all but stop around 25% or so then it says complete, the device should reboot, etc....
What happens instead is I get a blue screen that looks like the Download Mode saying
"system error this phone has been flashed with unauthorized Software and is locked. Call your mobile operator for additional support, etc.."
Not sure if this matters but this is my full model

SM-G955UZKATMB ( Tried finding this exact firmware but no luck.

I've watched plenty of YouTube Videos based on this Product and it all works, it loads to 100% and works perfectly fine.
I can provide you with Pictures if necessary, even a video.

I provided the Pdf form of my Purchase. Thanks in advance.


After this, I decided to try on my laptop and it reached 99% but stays there for like 5 minutes or so, then it fails.

So basically the firmware is not installing. I don't have a recovery mode for some reason it won't boot to this mode only Download mode.

Not sure if this matter but it doesn't charge either, it stays on the charging state, a blank circle with a thunderbolt symbol.

I CAN provide pictures of all this if needed.

Thanks again.

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