Big issue after update

Hi everyone,

I'm posting this thread because i'm really stuck since my Galaxy tab pro S (SM-W700) get updated by Windows 10.

The previous day everything was fine, and in the evening, when i wanted to switch it off, the device displays : "Update in progress, do not turn off your computer".

So i let it work and go to bed.

The day after, when i came to use it, i got a message : "boot guard verified dxe that is fail"

Impossible to enter windows, impossible to enter the UEFI, i'm really stuck...

So any help will be welcome !