Need Help asap HTC Desire 816 Dual Sim

Guys i already spent 5 hours on it trying things but no success... So my problem is that after unlocking my bootloader the device powered off then when it turned back on i had a grey/black screen with a Red triangle and an exclamation mark inside it. Any help would be appreciated. Btw i tried to flash the stock rom on it now i can't even go into the fastboot menu.
Any help would be appreciated guys i have 6 more hours left before i need to leave home.

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