mobile

Good day everyone, here is my issue.
I bought the nVidia Shield WiFi 16G and didn't do any modification to it at all (original bootloader, straight out the box)
I tried to do the OTA updates and it kept freezing at the nvidia logo.
Force shut down and bootloader to Recovery mode.
The update 1.2.1 installed when it started to boot (little android guy with the thing spinning in his chest).
Update 2.1 same issue.
I repeat the steps. Everything seemed fine as well, the loading bar finished.
Then the screen went black... pressing any button doesn't do anything. So I decide to plug it in my PC.

It says APX Driver can't be found (recognized that way by PC)
Screen is black
Cannot get in bootloader by pressing power & volume-.
I can turn on/off the tablet (I get the sound that it disconnect from my PC) by holding power button down.
Then pressing power & volume+ together, it connects again. Still Black screen.

I read a bunch of forum about the NVflash and nothing seems to work, all the process require me to go in Bootloader which I cannot access.
I am able to install drivers for the tablet to be recognized, but there is so many of them that I am not even sure they are the right one.
When I try the NVflash solutions, my command prompt says "fastboot" unrecognized command.

Nothing is working.... I need help
Thank you in advance