Hard bricked my OPO topic

Guys i hard bricked my opo i can't even enter in fastboot or recovery.. i was in the fastboot mode and flashed system.img, boot.img and the modem bin files and by mistake i executed fastboot reboot and I couldnt see anything on the screen , there was a vibration and that's all on pressing the power button for 5-10 secs.
How to enter fastboot mode again.. Please help..!! :crying: